Agenda Packets - 1990/07/16 - Laserfiche WebLink

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NOV 09 '90 16:05 BRW INC, P.3 Honorable Mayor and City Councilmembers July 10, 1990 • Page 2 We have reviewed the bridge structure to determine possible alternative improve- ments to enable the pathway construction. Three alternatives were investigated as follows: Alternative 1 • The existing steel plate beam guardrail under the bridge along the north side of County Road I would be removed, and concrete barrier would be placed along the back of the existing curb. The pathway would be routed between the concrete barrier and the existing concrete pillars. The pathway would be constricted to an approximate width of four feet in this area. This alternative would create safety concerns relative to the narrow width of the pathway and the close prox-- mity of County Road I traffic. The estimated cost of Alternative 1 improvements is approximately $14,500. Alternative 2 The existing steel plate beam guardrail under the bridge along the north side of County Road I would be removed and concrete barrier wall would be cast-in-place between the concrete pillars. The pathway would be routed between the pillars and the existing concrete curb. The pathway would be constricted to an approxi- • mate width of six feet in this area. This alternative would not provide any protection for the pathway from the adjacent roadway. • The estimated cost of Alternative 2 improvements is approximately $17,500. Alternative 3 This alternative includes routing the pathway north of the concrete bridge pillars to limit modifications to the existing guardrail system. The pathway construction would require some earthwork and the construction of a concrete retaining wall along the length of the bridge. The improvements would enable the construction of the pathway to the full eight-foot width. This alternative would provide the optimum pathway alignment based upon safety and the separation of pedestrians and bicycles from County Road I traffic. The estimated cost of Alternative 3 improvements is approximately $20,000, including bituminous pathway construction under the bridge. Minnesota Department of Transportation (Mn/DOT) and Ramsey County approval will be required for any improvements to the existing I-35W bridge. It should be noted that the review process could have some impacts to the pathway design and the project schedule. . For the purposes of this report, it has been assumed that Alternative 3 improve- ments would be made to the I-35W bridge, pending Mn/DOT and Ramsey County appro- val . Although Alternative 3 is the most expensive improvement plan, we feel • that it is the most feasible, considering the emphasis on safety which should. be