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Home My WebLink AboutDraft South Meridian Transportation Plan -'!'- ';' ~4FT' - South Meridian Transportation Plan Overland Road Connection Memo South Meridian Transportation Plan Overland Road Connection Memo RECEIVED JAN 1 6 2007 City of Meridian City Clerk Office December 8~ 2006 Objective The objectives of this memorandum are to identify issues involved with. the proposed extension of Overland Road between Ten Mile Road and Black Cat Road, to assess the impacts of this connection, and to determine the feasibility of this connection. ~ Features~ Constraints~ and Activities The following ar"e the physical [tJalures and constraints in the vicinity of the proposed Overland Road extension. The features are listed first and any constraints associated with that feature are described. · The existing Overland Road and Ten Mile Road intersection is situated close to the proposed Ten Mile Interchange. This close spacing could present operational issues and limited capacity for traffic traveling on Ten Mile Road. · The Overland Road and Ten Mile Road intersection is in an area of abruptly changing topography. A natural ridge exists in the vicinity with relatively large elevation changes in a small area. This topography makes constructing new roadway alignments and intersections difficult due to earthwork and right-of-way impacts associated with large cuts and fills. · The historic Ridenbaugh Canal travels to the south of Overland Road. The canal travels along the top of the ridge and large fills have been placed in certain locations to maintain grade on the canal. The historic nature of the canal and the large elevation changes make crossing the canal difficult and somewhat prohibitive. · A historic dairy currently exists in the northeast quadrant of the Overland Road and Ten Mile Road intersection. The existing farmhouse is situated quite close to the existing intersection. · A large gravel pit is currently operating south of Overland Road east of Black Cat Road. The pit has extremely steep side slopes. The Ten Mile Interchange Specific Area Plan has met with the owners and determined that the pit will end operations in the next 5-7 years and it will be redeveloped as open space of some kind. The deep depression and steep slopes created by the pit operations present a need for large fills to construct a roadway across the gravel pit. · The Tassa Subdivision exists northwest of the Overland Road and Ten Mile Road intersection. This subdivision is below the canal and close to the Overland Road and Ten Mile Road intersection. This position makes removing the current access and providing another one very difficult. · Additional residential development exists west of Ten Mile Road. hnpacts from a new adjacent roadway and altered access prelSent challenges to the Overland Road Connection. G~~~.~~~~ Page 1 -'!:. ... South Meridian Transportation Plan Overland Road Connection Memo The featur~s described are presented in Figure 1. Current on-going activities in this area include the following: · 1-84 Ten Mile Interchange Design. This project will design a new interchange to access 1-84 at Ten Mile Road in Meridian and complete an environmental document. The project will include: o Designing a new interchange o DefIning the right of way needs for the interchange o Defme the access management and spacing for the Ten Mile Interchange Area. o Gaining environmental clearance needed for construction o In order to make the new interchange function smoothly, it is necessary to improve the surrounding roadways. To accomplish this, the project will , also design the widening of Ten Mile Road between Overland and Franklin roads and design the improvements to the intersection of Tassa Street and Overland Road. · The Ten Mile Interchange Specific Area Plan. This plan is bcing conductcd by the City of Meridian to determine what the land use around the Ten Mile Interchange will be. Thisproject is estimating the impacts ofland use on the transportation system and how best to serve the resulting traffic. The Realigned Overland Road alignment alternative for the Overland Road connection is a result of this project's work. The Specific Area Plan team and the Idaho Transportation Department recognize the traffic operation concerns with the Ten Mile Interchange and the Overland Road / Ten Mile Road intersection being spaced too closely together. They are working together to detemline how best to provide good access and access management near the interchange. The Area Plan recommends removing or relocating the intersection further south along Ten Mile Road to provide better traffic signal spacing and thus better traffic progression and operation. · The South Meridian Comprehensive Plan. This project is working with the community to determine what the future land use in this area will be. Scveral public meetings and workshops have been conducted to develop a preferred alternative. An amendment to the City of Meridian Comprehensive Plan is being prepared to implement the preferred alternative. The area south of 1-84 near the Ten Mile interchange is included in his study. Alternative Alignments Two alternative alignments were evaluated in this analysis. The first alternative is an essentially straight connection between the existing Overland Road / Ten Mile Road and Overland Road / Black Cat Road intersections. The second alternative has been investigated and included in the Ten Mile Interchange Specific Area Plan. This alternative realigns Overland Road Y4 mile to the south starting roughly ~ mile east of Ten Mile Road. Overland Road then continues west for about % miles and then aligns with the existing Overland Road / Black Cat Road intersection. This alternative would require a new intersection of Overland Road at Ten Mile Road. ,,~=~~:~~c~s~:~ a~~~~a~~~~?r~~! Page 2 Suuth Jvleridian Transportation Plan Overland Road Connection Memo Both alternative conceptual alignments are presented in Figure 1. Figure 1 also presents the existing elevations at specific points along the alignment and the estimated grade between points for comparison pwpose~ unl y . Impacts Earthwork and Terrain Alternative 1-Straight Overland Road Alignment The terrain in the vicinity of the project is near the edge of a large blutlwith the Ridenbaugh canal tracing out a contour line of near constant elevation along the rim. A long with the necessity of crossing the canal at least twice with the straight alignment, a large amount of earthwork will be required to accommodate the undulating terrain. Figure 1 presents the approximate existing profile of the proposed alignment. There are slopes approaching 2: 1 with relief of greater than 30 feet in at least four different points across the proposed connection. Smoothing this type ofterrain will not only be an expensive undertaking, but will affect the local people, homes, businesses, and environment. Table 1 presents the estimated elevations at the points identified in Figure L The distance traveled horizontally is found on Column 1. Column 2 presents-the e~timated elevation for the point in Column I. Column 3 calculates the difference in elevation from the previous point Column 4 estimates the grade between the two adjacent points. Column 5 calculates the difference in elevation of each point from the elevation ofthe existing Overland Road / Ten Mile Road intersection. These elevations arc approximate and taken every 0.10 miles for conceptual analysis only. Several slopes in the area are steeper than those calculated in Table 1. ,', " Table.1 ~.- Altetniltive:1'Ov~rla.rld R'()..d-Coiln:ectiQO StraigbtAlignmerit' m'1. ,'-_. '//.-,2>;"':' L th Ii' '_ I'?<,_."'.",,' -, ~i~~l~( I J~~~~(iti -0.10 2664 0.00 2672 0.10 2674 0.20 2666 0.30 2647 0.40 2654 0.50 2661 0.60 2657 0.70 2640 0.73 2633 0.80 2654 0.85 2665 0.90 2659 1.00 2619 1.10 2618 3/' ,'<;h.angEdn · - Elevation (ft)" , o 8 2 -8 -19 7 7 -4 -17 -7 21 11 -6 -40 -1 "Washington Group International Integrated Engineering. Construction, and Management Solutions '.:4,'_---- .. ... . .. .. . ':Estim~t~d Gracli ,,(%) 0.00% 1.52% 0.38% -1.52% -3.60% 1.33% 1.33% -0.76% ~3.22% -4.42% 5.68% 4.17% -2.27% -7.58% -0.19% ~:'-:;.: ~i 5:e ..,' ~11~tt~.ri 45 53 55 47 28 35 42 38 21 14 35 46 40 o -1 Page 3 .. .. .., ..J i ~ g~~~*~~~~ --' "''''1.0''''''1.0",1.0", W, "''''''''''''''''''''''''' N ~ ~ ~ ;;; i N if <} ~ .. N ~ .. ~ ... ~. ;" ~ ~. .. -> W --' W . ... ~~~~~~~~~ "'<D"'''''''''''''\D''' "''''''''''''''''''''''N ::; ~ ".l:t C ~ ro t: u: ~ iii ~ ffi ~ ~ <:) \-01 .ij ~ c ~ ~ ro ~ ~ ~u ;.t ~ ~.- ~.~~ ~ ~.c l;:l +- ~ 6 ~ ~ oS ~ .~ u ~ <t o ~ -: ~ II ,i II Ii e '" s <.0 S Vl ..... w S --' ~ '" .s; I ~ to S .. s r<) .,; '" e s Gl S I South Meridian Trun~purtation Plan Overland Road Connection Memo The existing intersection at Overland Road and Ten Mil~ Road is almost the lowest point along the entire alignment. The elevation and grade changes are reasonable except for the 0.10 mile segment just west of the existing intersection. The extreme terrain in this area, due to the natural bluff and the Ridenbaugh canal, calls for a 7.58% grade to connect the existing points. This may become steeper when examined more closely with the vertical curves needed to accomplish this elevation change. Overland Road to the east of Ten Mile Road will have to be elevated to reduce the elevation difference as Overland Road travels over the Ridenbaugh Canal. This will require a significant amount of fill and additional right-of-way. Other locations along the straight alignment will also require fill, particularly between the segments of the canal where the terrain forms valleys with steep slopes. The active gravel pit that exists at the western side of the connection has created a deep depression ;:Ls a part of its activities. This can be seen in points 0.00 to 0.50. The straight alignment crosses through a portion of this and significant work will be required to provide a roadway at grade through this area. The Ten Mile Interchange Specific Area Plan tcam has met with the gravel pit owner and operator lo discuss the future plans for the pit. The owner feels the pit has at least 5 years of operation left. After the pit is done operating, it will be converted into open space, such as a park. When the pit. is reclaimed the extreme terrain relief should be reduced. Alternative 2-Realigned Overland Road Alignment Figure 1 presents the approximate existing profile of the proposed Realigned Overland Road. Table 2 presents the estimatt::d elevations at the points identified in Figure 1. The distance traveled horizontally is found on Column 1. Column 2 presents the estimated elevation for the point in Column 1. Column 3 calculates the difference in elevation from the previous point. Column 4 estimates the grade between the two adjacent points. Column 5 calculates the difference in elevation of each point from the elevation of the existing Overland Road / Ten Mile Road intersection. These elevations are approximate and taken every 0.10 mile for conceptual analysis only. Several slopes in the area are steeper than those calculated in Table 2. The existing intersection at Overland Road and Ten Mile Road is included for comparison purposes only. The elevation and grade changes are reasonable and less than 3% for most of the proposed alignment. Prom Black Cat Road along the rim of the gravel pit the elevations are fairly level and the deep depression can be avoided for the most part. This is a significant difference from the straight alignment. The last two 0.10 mile segments where the realigned Overland Road crosses the Ridenbaugh Canal and then ties into the existing Overland Road show the most drastic grade changes. The extreme terrain in this area, due to the natural bluff and the Ridenbaugh Canal, calls for a 7.39% grade followed by a 4.17% grade to connect the existing points. Overland Road to the east of Ten Mile Road will have to be elevated as it leaves the existing alignment to reduce the elevation difference as Overland Road travels over the Ridcnbaugh Canal. This will require a significant amount of fill and right-of-way. "waShington Group International Integrated Engineering, Construction, and Management SolutJons Page 5 South Meridian Transportation Plan Overland Road Connection Memo A developer has acquired the land where the realigned Overland Road wi11leave the existing alignment and travel to Ten Mile Road. He has expressed a desire to provide this realigned Overland Road to ACID:> and the Ten Mile Interchange Specific Area Plan team. His participation will make developing this alignment very attractive by providing the right-of-way and earthwork needed to make this realignment feasible. Re-grading of the developer's site may be necessary to create acceptable roadway grades. .0.10 2664 0 45 0.00 2672 8 53 0.10 2674 2 55 0.20 2674 0 55 0.30 2674 0 55 0.40 2671 -3 52 0.50 2675 4 56 0.60 2667 -8 . 48 0.70 2664 -3 45 0.80 2657 -7 38 0.85 2662 5 43 0.90 2669 7 50 1,00 2671 2 52 1.10 2668 -3 49 1.20 2665 -3 46 1.30 2650 -15 31 1.40 2611 -39 -8 1.50 2591 -20 . -28 Environmental There are two historic sites in the vicinity of the project, one heing the dairy in the northeast quadrant ofTen Mile Road and Overland Road and the other being the Ridenbaugh Canal. There are also several residences in a number of small subdivisions in the area. There is a large, active gravel pit on the east side of Black Cat Road north of Lamont Road. This pit may present a potential environmental concern if it is not reclaimed. Alternative 1-Straight Overland Road Alignment Both historic" sites will be impacted by the straight alignment for the proposed connection. The dairy will be impacted with the roadway widening of Overland Road and the improved Ten Mile Road and Overland Road intersection. Current ACHD right- of-way for Overland Road is 50 feet, 25 feet on either side from the center of the roadway. The existing farmhouse sits within 30 feet of the righl-uf-way line for Overland Road. Widening Overland Road to 5-lanes will require 96 feet of right-of-way, 48 feet on either side from the center of the roadway. This right.of-way would essentially run up to the fannhouse. If additional fill is needed to raise the elevation of Overland Road, as described earlier, this fill would require the fannhouse to be removed completely. "Washington Group International Integrated Engineering, Construction. and Management Solutions Page 6 South Meridian Transportation Plan Overland Road Connection Memo The Ridenbaugh Canal will have to be crossed at least twice and up to five times for a straight alignment. As depicted in Figure 1, these crossings will be relatively simple to design and construct but difficult to implement due to the historic nature of the canal. Also, the large fills needed to raise Overland Road over the canal and meet design standards for grade are not practical. The impacts to both of these historic sites will be difficult to mitigate due to the potential section 4(f) designation of these features. The straight alignment will impact approximately 40 single family homes in the nearby neighborhood. The added noise and emissions will be near the neighborhood. The alignment would place the roadway through the yards and near the houses of up to 10 residential homes. Several of these would have to be bought and removed to accommodate the roadway. The straight aligllll1ent would also pass through the northem section of the gravel pit. The pit most likely will be reclaimed for another use in the next 5-10 years; therefore potential environmental issues with it are not anticipated. Alternative 2-Realigned Overland Road Alignment The dairy will not be impacted with the Realigned Overland Road Alternative. The intersection of Ten Mile Road and Overland Road will be shifted roughly 'l4 mile to the south and away from the dairy. The Ridenbaugh Canal will have to be crossed only one time to provide the realigned Overland Road Connection, as depicted in Figure 1. The crossing alignment could be routed to cross the Ridenbaugh Canal at the existing crossing east ofTen Mile Road. This crossing will be relatively easy to design and construct and should be easier to justify as a crossing of the historic canal because it exists today. This is part of the developers' plan to provide this realigned Ovcrland Road. . The realigned Overland Road Connection will impact two single family homes in the vicinity. One of these is near the existing Ridenbaugh Canal crossing. Another farm is located along ten Mile Road near where the Realigned Overland Road will travel. It is assumed that these homes will be removed as part of the redevelopment. The Realigned Overland Road will also pass through fields near two homes along Nova Lane. These homes will be impacted by the additional traffic and noise the Realigned Overland Road will bring. Routing the roadway to the south of the canal moves it away from the remaining existing neighborhoods. Redevelopment of the area will be tied to the realigned Overland Road to provide good access to proposed homes. The realigned OverlandXoad Connection would travel along the northern edge of the gravel pit and then pass through the northern section to tie into the existing Black Cat Road / Overland Road intersection. The pit most likely will be reclaimed for another use in the next 5-10 years; therefore potential environmental issues with it are not anticipated. ~ Washington Group International Integrated Engineering,. Construction, and Management SolutIons Page 7 -' ' South Meridian Transportation Plan Overland Road Connection Memo Traffic Volumes and Patterns Connecting Overland Road from Black Cat Road to Ten Mile Road will affect the flow of traffic in the vicinity regardless of the alignment investigated. An analysis was performed using the COMPASS 2030 Trend and Community Choice models with Overland Road connected between Ten Mile Road and Black Cat Road. Table 3 presents the difference in the Trend Model with and without the Overland Road Connection. Large differences are highlighted in red. Large differences are those that are considered statistically significant based on the 2002 Travel Demand Forecast Model Calibration Report for Ada and Canyon Counties prepared by COMPASS. These large differences are dermed as greater than 15% for principal arterials and greater than 10% for minor arterials. Figure 2 presents the Trend Model traffic pattern changes with and without the Overland Road connection. \,,\,":',' 'Tabl~,:$;rtend' Model'Traffic Corri~ri$Qb 2Q30'P~i1,Yo_hirijiuf~ . , ..;':.,t." ".:e;.:."-'':,'' -. '.--:,. 2.:':,'),;.',.~~.':'-- ,----." .,,:',.:,',3,.""':''.-.'''''''''>' . --, . _ ....4,.... ; r";'4~~~' .. f~~~~..~(iii '''C''';".~l*-ijti 1% 9% 6% -6% -2% -5% 3% 4% 0% 1% I I ~ I I . . . 'nO '.. . . , :. .".' .... .~. ._::n: _ ..,.: .:. ...'.... ., .Il. ":: .',,:R~~dW~<: .. ,; . . ~'". .. - . :. /'".- ;,...... McDermott 20,100 20,300 200 McDermott 16100 17700 1600 Black Cat 12100 12900 800 Black Cat 14,300 13,500 -800 Black Cat 14,000 13,700 -300 Ten Mile 39 800 37 800 -2 000 Ten Mile 30 800 31 800 1000 Ten Mile 31,900 33,200 1.300 Linder 17900 17,900 0 Linder 17400 17,500 100 Overland 12300 22,800 10 500 Overland 0 16100 16.100 Overland 17,900 19,400 1,500 Victo 12,700 10,900 -1 800 Victo 14700 12,400 -2 300 Victor 13000 14 BUU 1,800 Daily traffic on the surrounding roadways, including McDermott Road, Black Cat Road, Ten Mile Road, Linder Road, Overland Road, Lamont Road, and Victory Road were found to increase by 17% on average. Traffic along Overland Road increased by 10,500 vehicles per day (vpd) (46%) west of the connection to McDermott Road and by 1,500 vpd (8%) to the east ofTen Mile Road. Traffic on Victory Road decreased by 1,800 vpd (17%) east of McDermott Road and by 2,300 vpd (19%) east of Black Cat Road while increasing by 1,800 vpd (12%) east of Linder Road. Generally, vehicles are using Overland Road to travel from McDermott Road to Ten Mile Road and beyund rather than using Victory Road. Also, more trips are traveling north ofI-84 on McDermott Road and Black Cat Road rather than using Ten Mile Road. McDermott Road is modeled as principal arterial in the COMPASS models and is connected to State Highway 16 to the north and to KUlla-Mora Road to the south. "Washington Group International Intcgrotcd EngineerJng, Con..tru<;tle>n. lInd Management Se>lution5 Page 8 ~. . r. -~ ... <0 LoI .... -<l; l- V> Q: W I- 3 w W~ ;::l~ / ~I \/ it it Ul .... ;: it .. . ~fi\* @j\SJO ~@~ [ilfi\~ @JW+ rID~~ ~W~ ll'v'OM M30NI1 "#. 'f !(V <( ! ~ \ , "- ... ... ~@...., ~ g ~ \ g I<i + \ . w > ;: <( Z Q: w .... ::i. a1 z (i) ~ I I / ..; ,. ll'v'OM 1';':) )1:)\'18 ~@~ "#. <<> '1 HID ; ~ ~o@o~ ~ II"!. ~ !:: !::: + '#. C"l +" (V ~ ~cv 00* ll'v'OM 3111"l N31 ~ a '1 <'l .... 2: .... <( Z Q: w .... :;;f ~ ;:: u ~ u e ~ .... ::; 0- Q I- ::> e :J: I- 10 <i l- e I- ,. ~ e e z II;! I- Sl ~(ID~ ~~~ ll'v'OM UOt'lM30::J1"l ~ a Q: .... Z o ~ ...J z e ;::: f.J z ~ u ~ ..I II: ... > e ~ i' ;;;t l- e I- ,. ..I =< e ~ II! I- e '" "iF- ~ @ ~ ~~~ liJ\o/' I :J: U '" '#. ~ <i l- e I- ,. ..I =< e e ~ :; (U ~ g o ~ * .... ~ B 6 c ~~ ~ C'\t iU~ ; ~ U '6 ~ Et'~ ~ o~ ~ ~c j ~~ 0 o~ V'l ~ i:i :I: U <( ~ Q o a:: )- a:: o .... u ;: IJ Ii -1 if I~ " e 1-....1"'" ! ~! i j i ~ ~a! l South Meridian Transportation Plan Overland Road Connection Memo Table 4 presents the difference in the Community Choices Model with and without the Overland Road Connection. Large differences are highlighted in red and are defined as greater than 15% for principal arterials and greater than 10% fur min~r arterials. Figure 3 ii::-'-"Tablij'4;,Cbm-m'i.lni ".- Chol~,.;!l$ Moder Tlljffl(f Com . ari$cin 203-0 Dail ..~ V9Ium~l!f ::- ;:' _", ....:~'::.:..~.;>;' """-': .::\',i;;' ~-:,:,~(J~~!!~,,~ McDermott McDermott Black Cat Black Cat Black Cat Ten Mile Ten Mile Ten Mile Linder Linder Overland Overland Overland Victo Victo Vieto -. ,-. ---------, "", :.-:-,,:1",-_,,-_ " ,- . -' ;_'~' :;> -C~~~~~I~\_ ~9ci1t1(l~~ _ Cfio~~~~ rJiodal Nt Overland Nt Viclo Nt Overland NtLamont Nt Viclo Nt Overland NtLamonl Nt Vielo Nt Overland Nt Vielo Et McDermott Et Black Cal EI Ton Mile Et McDermott EI Black Cat EtTen Mile 21 900 16800 15,400 12900 12300 36,900 21,200 19100 27,100 13100 17,800 o 19900 12,700 15700 14400 "_-~--'-. ;,: 2~,',"'::-'-_;' -."- :::,:;;" 3_: ,~; :'c :t~lt~~~i:l/~': -;~'-';~~~~~J~.1) 20700 -1,200 19400 2,600 15500 100 11800 -1100 12,400 100 34.900 -2 000 19,300 -1 900 20,500 1 400 26 500 -600 11200 -1900 29 000 11,200 17,500 17500 22,400 2,500 13,900 1 200 13,400 -2,300 15100 700 '-' -,-- .-'--.---4. --,--.--, ':. '."_ ~.:_.-..:;.o .:;.~ _. .". '.:': -.' ." - '-:~ .. ':. '";' :" ~ '::: :' - ; . ::."" "-':-.' :~i}~~~rig.. (2~~ 1'1.. ". :.;:..i....:..- .:-":" -6% presents the Community Choices Model traffic pattern changes with and without the Overland Road connection. The results for the Community Choice Model analysis are very similar to those from the Trend Model analysis. Daily traffic on the surrounding roadways, including McDermutt Road, Black Cat Road, Ten Mile Road, Linder Road, Overland Road, Lamont Road, and Victory Road were found to increase by 21 % on average. Traffic along Overland Road increased by 11,200 vehicles per day (vpd) (39%) west of the connection to McDermott Road and by 2,500 vpd (II %) to the east ofTen Mile Road. Traffic on Victory Road decreased by 2,300 vpd (17%) east of Black Cat Road while increasing by 1,200 vpd (9%) east of McDermott Road. Generally, vehicles are using Overland Road to travel from McDermott Road to Ten Mile Road and beyond rather than using Victory Road. Improvements to the roadway system in this vicinity will be similar for each model with or without the Overland Road Connection. The increase in traffic volumes on Overland Road east ofTen Mile Road will not change the planned 5-lane section for this segment included in the Capital Improvements Program (eIP). The Overland Road Connection from Ten Mile Road to Black Cat Road will be an entirely new roadway and is not currently included in the CIP. This segment of roadway will require a 3-lane section to accommodate the forecasted traffic volumes from both models at an acceptable Level of Service (LOS) D. This roadway is not classified at this time. Overland Road from McDermott Road to Black Cat Road is not included in the CIP for scheduled improvements. However, this segment will require widening if the Overland Road connection is constructed. The volumes require a 5-lane section to operate at an "washington Group International Integrated Engineering, construction, ana MBnagement Solutions Page 10 .. .. ... ..J u:: .. .. 'f'. -~ fo ~~ ~ OVOl::! l::!30NIl o .n ~(ID~ ~(i)~ ~~ ~ 8~ ~ r- '" . !:3 == I "l "l C'f))l ~ !lJ .- ~B~.~ #. ~ .... ~ <D .- ~ 0 :z .- + + ... Q ~ .- (j) ~z .c <0 u6 g CJ ... a:: .... <<( Q ~~ ~ .... z '" .,;;( a:: ...J 00 ~ ~~ ... a:: .... w ~ :> O<l CJ U \ 8 w , ...Cl " ~ II .-:~ " " CJ ~~ a:: / ~OO~ ~ (~)' , OOOO~ :>- ...... a:: ........ o g ~ \ CJ ~ ~ai'" \ .... '" ... "i' 2i g + u .., .., "l _ OVOl::! 311t'l N3! '> . g.' \7 JJ II 1n "l #. e .... ... ... z :> (:) S Q @ - z a:: CJ i Lo' ... .... et; :> ;;i .... lj s ~ z ~ CJ Z ~ 'I';;. a:: ... -' .... I l- ~ , / /' jH .". /' / r[[ , " OVOl::! !'f' >l:)'f18 ~(ID ~ z ~@~ e ~(ID~ ;: z u = ~ all ...... ... l11. "t.. 'I:"'" ~ ~ + ~ ~ !::! !:::! + e U z z ~ e U #. Ii e CD ... ~ "" ':j? e '" ~ '" '" (ID l- i> i 51 i :z: :J: a) CJ i I- U a:: i' '" 0 ~ ~ ~ ~ ~ l- I- l- e e e ...J l- I- I- a:: >- ~ >- ~ .... :> ... ~ ~ ~ CJ c e e e e e z z z ll! "" ... '" '" l- I- I- o 0 0 ~~~ a ~ ~~~ ~oo~ ~ 00<') <0 ... .- c;i g "i' ~ ~ + OVOl::! UOt'll::l30:Jt'l -! South Meridian Transportation Plan Overland Road Connection Memo acceptable LOS D. The segment from Ten Mile Road to Linder Road also requires a 5- lane section. This may present the need to widen the Overland Road Connection to 5- lanes as well. Additional, detailed traffic studies need to be conducted to determine thl.: functional classification of the Overland Road Connection and the appropriate roadway cross-section. Overland Road does not continue west of McDermott Road. The proposed connection will not extend Overland Road into Canyon County and will only serve local traffic accessing their homes in this area. The proposed interchange at Ten Mile Road will provide access for local residents as well as for Canyon County residents for regional trips. Franklin Road on the north side ofI-84 and Victory Road and Amity Road do connect Canyon County to Ada County and will also serve as regional roadways_ Washington Group held discussions with the Nampa-Highway District and the City of Nampa Public Works Department to discuss the potential for a future extension of Overland Road from Robinson Road to McDermott Road. Orchard Avenue and Airport Road could both be extended to conncct with Overland Road. However, neither the Nampa Highway District nor the City ofNampa has any plans to extend either of these roads to connect with Overland Road. Airport Road intersects McDermott Road roughly ~ mile south of the Overland Road and McDermott Road intersection. The City of Nampa does plan to widen Airport Road to 5- lanes in the future as well as eliminate some reverse curves in the alignment to provide a principal arterial roadway. If Overland Road is conncctcd from Ten Mile Road to Black Cat Road a direct connection with Airport Road would provide a regional principal arterial south ofI-84. This may be a feasible project in the future and discussions with the City ofNampa should be conducted if the Overland Road connection is constructed. This may require a Long-Range Transportation Plan update as well and COMPASS should be involved. The Ten Mile Interchange Study is currently gathering public input. The interchangc will be designed using this input. Additionally, the Ten Mile Interchange Specific Area Plan being conducted by the City of Meridian. The Overland Road intersection is close to the proposed interchange ramps and this close spacing would interrupt the smooth flow of traffic in the area. The Specific Area Plan and the Idaho Transportation Department recognize the traffic operation concerns with the Ten Mile Interchange and the Overland Road / Ten Mile Road intersection being spaced too closely together. They are working together to determine how best to provide good access and access management near the interchange. The Area Plan recommends removing or relocating the intersection further south along Ten Mile Road to provide better traffic signal spacing and thus better traffic progression and operation. Several interchange alternatives show the Overland Road and Ten Mile Road intersection being relocated, realigned, or removed altogether, similar to the Realigned Overland Road Alignment identified in Figure 1. G=~~~.:!.~~~~,?,~~~ Page 12 South Meridian Transportatiun Plan Overland Road Connection Memo Recommendations Washington Group recommends including the realigned Overland Road Connection from Black Cat Road to Ten Mile Road in future transportation plans based on our analysis and the following reasons: . The Ten Mile Interchange design and Specific Area Study both recommend the removal or relocation of the Overland Road and Ten Mile Road intersection to provide better traffic signal spacing :md access management on Ten Mile Road as it leads to the proposed interchange. . The environmental impacts are minimal with this alignment. . The historic dairy will not be disturbed while the Ridenbaugh Canal will only be crossed one time at an existing crossing. . The topography of the area is fairly consistent from Ten Mile Road to Black Cat Road. . The steep portion from Ten Mile Road to tllC east will be constructed by a developer. The roadway can be designed to make a smoother transition by re- grading the developer's site. Right-of-way will be provided by the developer. Washington Group recommends not following the straight alignment Overland Road Connection from Black Cat Road to Ten Mile Road for the following reasons: . The location of the existing Overland Road and Ten Mile Road intersection is too close to the proposed Ten Mile Interchange to provide good traffic operations. The future signalized intersections will be spaced too closely to provide adequate signal progression. . The quality of life in the surrounding neighborhoods will decrease due to noise and emissions, and homes may need to be removed. . The environmental impacts are large with this alignment. . The historic dairy will be impacted by the widening of Overland Road and any fill needed to raise the road to meet design standards for grade will require the fannhouse to be removed completely. . The Ridenbaugh Canal will be disturbed by up to 5 new crossings. Also, the need to raise Overland Road over the canal will require very large fills that may not be practical. . The topography of the area is very difficult to work with. Costs associated with canal crossings and the earthwork in the vicinity may be prohibitive. "~~~:=~~C~5~~~ a~~~~:~=~~~ Page 13