| Abstract: | Two large floods, 3 and 4 times the estimated 100-year peak discharge, occurred in 1986 and 1991 at a timber-pile bridge over Razor Creek in Montana. A bridge section surveyed after the 1991 flood was compared with a 1955 design section and showed total scour of 0.85 m at the left abutment, 2.23 m at the right abutment, and 0. 94 m at the pile bents. Calculated total scour based on equations recommended by the Federal Highway Administration and data obtained after the 1991 flood was 3.20 m at the left abutment, 4.36 m at the right abutment, and 2.13 m at the pile bents. Residual scour from floods prior to 1986 was presumed to be negligible because no floods of significant magnitude were documented. Also, scour for the 1986 flood is believed to be significantly less than for the 1991 flood because the 1986 peak discharge was significantly smaller and the contracted section for the 1986 peak discharge was 22 m upstream from the bridge. |
| Genre: | Conference Paper |
| ProdID: | 70017352 |
| Citation Author: | Holnbeck, Stephen, R.; Parrett, Charles; Tillinger, Todd, N. |
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| Citation Editor: | Shen Hsieh WenSu S.T.Wen Feng |
| Citation End Page: | 2255 |
| Citation Issue: | pt 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Proceedings - National Conference on Hydraulic Engineering |
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| Citation Number Of Pages: | 7 |
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| Citation Publisher: | Publ by ASCE |
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| Citation Search Results Text: | Bridge scour and change in contracted section, Razor Creek; 1993; Conference Paper; Proceedings - National Conference on Hydraulic Engineering; Holnbeck, Stephen, R.; Parrett, Charles; Tillinger, Todd, N. |
| Citation Start Page: | 2249 |
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| Citation Year: | 1993 |
| Type: | citation/reference |
| Text: | Bridge scour and change in contracted section, Razor Creek; 1993; Conference Paper; Proceedings - National Conference on Hydraulic Engineering; Holnbeck, Stephen, R.; Parrett, Charles; Tillinger, Todd, N. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1993 00:00 -0600 |
| Publisher: | Publ by ASCE |
