Local Pier Scour

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General ScourLong term scour, aggradation or degradation, river migration

may occur whether or not there was a bridge crossing or constriction in the stream. Picture shows degradation caused by gravel mining in the stream.

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Typical Local Abutment Scour Problem: Abutment Fill Loss

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Monitoring SignBridge 6502 TH 32 over South Branch Wild Rice River

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Cross Section of Scour Hole

1120.001125.001130.001135.001140.001145.001150.001155.001160.00

1000.00 1050.00 1100.00 1150.00

Survey 2004 Survey- Original Pier Footing Seal

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Online Resources

Bridge Scour website:http://ihub/bridge/hydraulics/scour/index.html

GIS Benchmark website:http://www.dot.state.mn.us/maps/geodetic/

Mn/DOT Interactive Basemap:http://www.dot.state.mn.us/maps/gisweb/

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