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A. Update on MN River Crossing and Flying Cloud Drive ImprovementsA CITY OF MEMORANDUM CHONSEN TO: Todd Gerhardt, City Manager 7700 Market Boulevard PO Box Boulevard FROM: Paul Oehme, Director of Public Works /City Engineer Chanhassen, MN 55317 DATE: December 10, 2012 Administration SUBJ: Update on Minnesota River Crossing and Flying Cloud Drive Phone: 952.227.1100 Fax: 952.227.1110 (CSAH 61) Improvements - PW067E2 Building Inspections BACKGROUND Phone: 952.227.1180 Fax: 952.227.1190 The Counties of Carver and Scott, along with the Minnesota Department of Fax: 952.227.1110 Transportation (MnDOT) and the Cities of Chanhassen and Shakopee, are Engineering proceeding with the design of a four -lane river bridge over the Minnesota River that Phone: 952.227.1160 Fax: 952.227.1170 will protect the traveling public from 100 -year flooding events. The bridge and road 7901 Park Place Phone: 952.227.1300 approach construction is anticipated to begin in the fall of 2014. In addition to the Finance TH 101 bridge and road approaches, Carver County is proceeding with design to Phone: 952.227.1140 reconstruct the TH 101 /CSAH 61 (old 212) intersection, known as the "Y" Fax: 952.227.1110 intersection, to accommodate future traffic impacts. The plan is to construct the "Y" Phone: 952.227.1125 intersection at the same time as the river bridge project to realize economies of scale Park & Recreation Phone: 952.227.1120 and minimize impacts to the travelling public in subsequent years. The river bridge Fax: 952.227.1110 project has received $29,000,000 in funding through the Trunk Highway Flood www.ci.chanhassen.mn.us Mitigation Program (Chapter 152 Bridge Bonds) and the Local Road Improvement Recreation Center Program (GO Bonds). The total project cost is currently estimated at $39,000,000. 2310 Coulter Boulevard Carver & Scott Counties have committed to funding the shortfall. The "Y" Phone: 952.227.1400 intersection reconstruction is currently estimated to cost $15,000,000. Fax: 952.227.1404 Planning & DISCUSSION Natural Resources Phone: 952.227.1130 In November, MnDOT initiated a CRAVE (Cost Risk Analysis Value Engineering) Fax: 952.227.1110 study in which they hired a consultant to determine risks and opportunities for cost reductions on the project. The CRAVE Study Group came up with $10.45 million Public Works dollars in cost savings for the TH 101 River Crossing project. MnDOT is currently 7901 Park Place Phone: 952.227.1300 studying which of these cost saving recommendations will be implemented in the Fax: 952.227.1310 design. One of the major items the CRAVE Study identified was the river bridge construction could take place under traffic. For this proposal, traffic would be Senior Center shifted to one side of the crossing while the bridge is being built on the other side. Phone: 952.227.1125 Once half of the bridge is built, traffic would switch to the new bridge section while Fax: 952.227.1110 the other half of the bridge is constructed. MnDOT is still verifying if this option is Web Site feasible. www.ci.chanhassen.mn.us Chanhassen is a Community for Life -Providing for Today and Planning for Tomorrow Mr. Todd Gerhardt December 10, 2012 Page 2 The "Y" intersection reconstruction is currently estimated to cost $15,000,000. This estimate is for the roundabout alternatives. The other offset intersection alternatives were more expensive to construct and need significantly more right -of -way. The CRAVE study did evaluate the interchange alternative. This option is much more expensive to construct, would be difficult to stage at this time to go up the bluff, and would have a significant amount of throw away costs when the interchange is actually constructed. The roundabout alternative traffic model showed it will function just as well as the interchange alternative for 2040 traffic, cost much less to construct, and has less environmental impacts. The roundabout would be constructed about 10' higher than the existing elevation of CSAH 61 to plan for a north leg of the roundabout up the bluff. The CRAVE study did identify about $2.0 million dollars of potential cost savings for the "Y" roundabout improvements. . Carver County is studying if these recommendations can be included in the design. MnDOT and the county have been busy taking borings and cone penetrometer tests to document the extent of the poor soils in the area. Generally, the soils in the area are very poor' and swamp deposits vary between 5 and 28 feet thick. For any improvement to be made in the area, soil corrections will have to be made which will be the single biggest cost. Cultural resource investigation field studies are ongoing. This work is expected to be completed by the end of the year. The "Y" improvements will be funded with a combination of County and Flexible Highway Account Funds (turnback funds). About one -third of the roadway costs and the trail improvements are not turnback fund eligible. The County has proposed the City participate in non - turnback eligible costs according to the County's highway cost share policy. Much more discussion with the County will need to take place on any cost sharing agreement. The state turnback account does not have sufficient capacity to fund the "Y" project until 2020 based on current revenue projections and the backlog of other turnback projects, including projects on other portions of CSAH 61 (old 212) and TH 101. There is simply not enough revenue currently in the turnback account to keep up with demand in the metro area. Carver County will be requesting the Legislature provide additional funding to the TH 101 Bridge construction project and increase funding for the Flexible Highway Account to accelerate the TH 101 /CSAH 61 "Y" project and other important turnback projects in the region. Staff feels the City should support Carver County's legislative funding request. Along with the MnDOT Minnesota River crossing project, Hennepin County is planning to make improvement to CSAH 61. Hennepin County is preparing for the reconstruction of CSAH 61 between the county line and Charlson Road. This is about a 3.5 mile section of roadway. This section of CSAH 61, old Trunk Highway 212, was a turnback from the State of Minnesota in 2009. The project is in the early stages of the development process and construction is anticipated to start g: \eng \public \pw067e2 hwy 41 eis & river crossing studies \bkgd 121012 update on 101 bridge and wye imp.doc Mr. Todd Gerhardt December 10, 2012 Page 2 in the summer of 2015. A small portion of CSAH 61 floods when the Minnesota River floods TH 101. The roadway will be reconstructed above the 100 -year Minnesota River flood stage and is currently planned to be widened to a 3 -lane roadway section. A pedestrian trail is also planned along the corridor. This project may require full road closure during the summer of 2015. SCHEDULE Below is a tentative schedule for the projects: Value Engineering Review Selection of Preferred Alternative for "Y" area MnDOT bid for girder bridge fabrication MnDOT bid for Minnesota River Crossing project Start Minnesota River Crossing construction Carver County bids out CSAH 61 project MnDOT and Carver County project complete Hennepin County project construction start ATTACHMENTS 1. Project Area Exhibit 2. Roundabout Exhibit November 2012 December 2012 June 2014 Fall 2014 Fall /Winter 2014/2015 Fall 2014 Fall 2015 Summer 2015 g: \eng\public \pw067e2 hwy 41 eis & river crossing studies \bkgd 121012 update on 101 bridge and wye imp.doc PROJECTS IN THE TH 101 ! CSAH 61 AREA Pioneer Trail to Lyman Blvd TH 101 North to Pioneer Trail Project development process not determined Potential Realignment Proposed 44ane Schedule not detefawned CSAH 61 East CSAH 61 west Carver County lead Schedule notclater dned TH 101 River Crossing f MnDOT lead 44ane bridge At -grade intersection with CSAH 61 TH 1011 CSAH 61 Wye y 2014 letting Carver County lead • 44ane design 2014 telling nr�''r` —D O mropuo xo.o... evs,uc x�cx. or FLI- CLdO — T-C& —T— G •a. ttnNc CIOID q E.& ILIIK MOID