Agenda - Council - 04/25/2017 - Laserfiche WebLink

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Mississippi Skyway Preliminary Estimated Project Costs and Engineering Report Funding Sources SRF Consulting Group,Inc.was engaged to assess the feasibility A preliminary estimate of project costs has been developed of constructing a grade separated crossing over THIO and based on the proposed pedestrian bridge options presented in Riverdale Drive. The study included the following objectives: this report. The preferred bridge concept costs are estimated at $5.1 million to $5.6 million. These costs are based on 2015 » Identify potential locations for a new pedestrian bridge crossing ofTH dollars and include a 10% contingency and an estimated 20% 10 and Riverdale Drive. » Conduct preliminary analysis of alignments and profiles for further for engineering and construction administration cost. consideration in future design phases. In 2014, the National Parks Service (NPS) awarded the City a » Identify impacts to adjacent private and public lands for possible grant for construction related activity for the Mississippi Skyway Right-of-Way(ROW)easements and acquisitions. pedestrian bridge. The "MISSISSIPPI RIVER SKYWAY BRIDGE - » Identify impacts to existing utilities. MISSISSIPPI NATIONAL RIVER AND RECREATION AREA (MISS)" » Outline potential structure types and aesthetic options for grant provides total program funding of$490,000 with a grant consideration. availability sun-set date in 2017. » Provide an outline of future tasks to continue to move the project The City is considering multiple additional funding options and forward in compliance with anticipated funding requirements. » Review possible additional site development options for the Partners for the final design considerations, construction, and surrounding site to facilitate pedestrian and bicycle connections to the maintenance of the proposed pedestrian bridge facility. approach areas. This report has conservatively assumed the use of typical Throughout the process, multiple alignments were considered Federal funding sources for purposes of estimating total project (see Appendix B &Appendix J). With assistance from the City, costs. Note that multiple Federal funding sources are available, the preferred alignment selected was a straight alignment and each may present a different set of specific project criteria. from the Ramsey Northstar Station over TH 10 and Riverdale Drive with a circular helix approach ramp on the south side of Next Steps Riverdale Drive. The Mississippi Skyway pedestrian bridge project will likely Wayfinding and bridge aesthetics were also taken into require a Cooperative Construction Agreement between the consideration. The proposed bridge aesthetics take their cue City and MnDOT. from the surrounding civic architecture including City Hall,the municipal parking ramp, and the Northstar Ramsey Station. An Environmental Review Summary has been prepared (see Undoubtedly, MnDOT, local stakeholders and the greater Appendix H) to identify existing resources within the vicinity community will have an interest in the visual quality of the of the Mississippi Skyway project. An environmental review structure. Further input from stakeholders will help ensure that document will be needed to meet requirements of the National the bridge will be an attractive and distinctive civic landmark Environmental Policy Act. The type of document will be that reflects community values. determined when funding is identified based on coordination with funding partners and federal agencies. The construction Preferred Pedestrian Bridge Concept D of the bridge is anticipated to be a Categorical Exclusion (Type II document; no significant environmental impacts are Seven different structure types were considered as feasible anticipated.) options for the pedestrian bridge. The City has identified Right-of-Way: Easements and land acquisitions can be Bridge Concept D in Appendix E as the preferred option,which negotiated at this time and should be prepared to satisfy Federal includes dual bowstring truss center spans with concrete girder real estate acquisition statutes and regulations. side spans. Preferred Bridge Concept D is described as follows: » Visual emphasis is at the center of the bridge at the arcing trusses. Utility coordination may begin with impacted utilities so that » The new bridge will be distinct from the existing enclosed skyway but utility owners can begin to determine the extent of the impact will complement its appearance. and the preliminary resolution, whether it be modification or » Center trusses and vertical piers are the dominant architectural relocation. features. MnDOT coordination may continue. A MnDOT State/Federal A center pier is required in the THIO median. Decorative railing Aid project coordinatorwill need to be assigned for determining enclosure creates an open"experience on the deck without a roof. the State/Federal processes to be followed and for review of preliminary and final construction documents. iii I Mississippi Skyway Over TH10 Preliminary Engineering Report December 2014