| 20.8 | ABOVE 20.8 FT...EXPECT WIDESPREAD FLOODING IN PHILOMATH...ESPECIALLY ON THE SOUTH SIDE IN THE VICINITY OF CHAPEL DRIVE AND GRANGE HALL ROAD...IN CENTRAL BENTON COUNTY...AND PORTIONS OF CORVALLIS. | | 20.7 | ABOVE 20.7 FT...EXPECT ROAD FLOODING IN PHILOMATH...ESPECIALLY IN THE SOUTH PART OF TOWN IN THE VICINITY OF CHAPEL DRIVE AND GRANGE HALL ROAD. PORTIONS OF HIGHWAY 99W IN CORVALLIS HAVE HISTORICALLY BEEN FLOODED AT THIS LEVEL. IF THE WILLAMETTE RIVER STAGE AT CORVALLIS IS AT 18 FT OR HIGHER...WIDESPREAD FLOODING OF COUNTY ROADS AND ROAD CLOUSURES CAN BE EXPECTED. IF THE WILLAMETTE STAGE AT CORVALLIS IS BELOW 18 FT...ROADS MAY STILL BE PASSABLE. | | 20.5 | ABOVE 20.5 FT...EXPECT FLOODING OF SOME HOMES IN THE SOUTHERN PART OF CORVALLIS TO BEGIN. IN SOUTH CORVALLIS...A TRAILER PARK AND THE EVANITE FIBER PLANT BEGIN TO FLOOD. FLOODING MAY BEGIN IN THE VICINITY OF CHAPEL DRIVE AND GRANGE HALL ROAD ON THE SOUTH SIDE OF PHILOMATH. PROBLEMS WITH THE SEWERS HAVE HISTORICALLY BEGUN IN PHILOMATH AT THIS AND HIGHER STAGES. | | 20.0 | ABOVE 20.0 FT...EXPECT WIDESPREAD LOW LAND AND AGRICULTURAL FLOODING. SOME STRUCTURES ALONG THE RIVER MAY BEGIN TO FLOOD. |
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1) 21.11 ft on 12/30/2005
2) 20.91 ft on 01/15/1974
3) 20.90 ft on 12/06/1981
4) 20.89 ft on 12/16/1982
5) 20.86 ft on 12/25/1980
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1) 0.00 ft on 08/23/1967
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