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Pelican Group Continues Water Quality Project. Project #2.
First Small Dam Complete
Water Pollution
Comprehensive Watershed Management Plan
Small Dams Protect Our Farmland Resources
Environmentally Friendly
Barr Engineering Company
More..
Last Update: 07-16-2008
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Road Retentions Projects (Area II MN River Basin
Projects)
Road retentions are constructed by replacing a deficit bridge or culvert and replacing it with a smaller sized
culvert. The roadway is built up to serve as a temporary dam embankment to store floodwaters during periods of heavy
rainfall or snowmelt. The floodwaters are "metered" out over a period of time up to 48 hours. in most situations,
road conditions are greatly improved from a safety and road stability standpoint. MNDOT Township Bridge Funds and
State Aid Funds can be utilized for these projects as there are typically considerable savings in using smaller
diameter culverts to compensate for the cost of additional road fill.
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