07/09/2012 Council Packet - Laserfiche WebLink

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Estimate of Roadway Cos New Marshall and Swift estimates a road coristruction cost new of $376,086. This is stighty more than the $339.200 estimted by the City of Woodbury. The City of Lakeville estimated a higher cost of 5392.200, but this was based on a recent estimate for a slightly wider 32-foot road with a sidewalk on one side. The State Aid Engineer at the MN DOT said that their average statewide cost for a 28-foot road with a surmountabe curb and storm sewer was $500,000 per mile, which averages $95 per lineal foot, for a total of $243,800. The MN DOT cost is lower because it is based on a statewide average. In my opinion, the cost new of the subject roadway would be approximately $350'000. This is between the estimates from Marshall & Swift and the City Engineers in Woodbury and Lakeville. Bridge and Lighting Estimates Jim Oellefeuille at TKDA estimated the bridge repacement cost at $336,000 for the construction plus $55,000 for design and geo-technica work, for a total of $391.000. The street tighting and signage nage costs are taken from MarshaU and Swift. Depreciation The MN DOT Engineer said that asphalt road surfaces are designed to last 25 years, though limited street maintenance budgets force them to remain in use longer than that. He sad that the road bed, storm sewer, and curb and gutter would typically last 50 years, He provided these re-paving costs per mile: Milling - $30,000 Paving with asphalt -$110.DOU Total - $140,000 per mile, or $26.50 per lineal foot (28% of total cost new) The subjec property receives si nifinandyleaswuarandtoarthanapub|icnuadway- It is used by only 5 homeowners and their guests. The homeowner's association has never used salt to clear snow and ice off the road, which would greatly increase the expected life of the roadway. Therefore, the life expectancy of the subject's roadway is estimated at 1.5 times the life ofa public road — 75 years for the long term components and 38 years for the asphalt paving. The subject roadway was constructed in 1993 and the homeowners have not re-paved it. They have applied a surface treatment to prolong the life of the asphalt 4 years ago. The depreciation on the subjec roadway is estimated at 25% for the long term components (road bed, curb and gutter sewer) and 50% for the asphalt surface, based upon the 75-year and 38-year life expectancies discussed previously. The asphalt surface component is estimated at 28% of the total road cost, based on the MN DOT discussion previously. The bridge depreciation is estimated at 30% because most of the structure is concrete, but the asphalt surface will have a shorter lifespan, The street lights are estimated to have a useful life of 75 years (25% depreciation), similar to the road bed. The sign is estimated to have a useful life of 40 years (50% depreciation). WALKER APPRAISALS 5