Perkiomen Creek at Graterford, Montgomery County PA (GRAP1)
Gage Location: Montgomery County, PennsylvaniaSite Location: Montgomery County, Pennsylvania
Latitude: 40.229Longitude: -75.452Elevation: 112.66 ft. MSLDrainage Area: 279 Sq. Mi.
Minor Stage: 11 ft. Moderate Stage: 13 ft.Major Stage: 16 ft.
First Flood: 1915-01-07Last Flood: 2014-05-01 Crest: 16.2 ft.Datum change: 1927-09-14Number of Floods: 82

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Height Above Flood Stage for Entire Period of Record
Height Above FSTotal OccurencePercent of Crest OccurrenceCumulative Total Flood OccurrencePercent of Floods above Listed Value
11 ft to 12 ft2227.811 ft or above 79100.0
12 ft to 13 ft1924.112 ft or above 5772.2
13 ft to 14 ft1417.713 ft or above 3848.1
14 ft to 15 ft1316.514 ft or above 2430.4
15 ft to 16 ft33.815 ft or above 1113.9
16 ft to 17 ft56.316 ft or above 810.1
17 ft to 18 ft11.317 ft or above 33.8
18 ft to 19 ft22.518 ft or above 22.5
Height Above Flood Stage After Datum Change
Height Above FSTotal OccurencePercent of Crest OccurrenceCumulative Total Flood OccurrencePercent of Floods above Listed Value
11 ft to 12 ft2229.311 ft or above 75100.0
12 ft to 13 ft1824.012 ft or above 5370.7
13 ft to 14 ft1317.313 ft or above 3546.7
14 ft to 15 ft1114.714 ft or above 2229.3
15 ft to 16 ft34.015 ft or above 1114.7
16 ft to 17 ft56.716 ft or above 810.7
17 ft to 18 ft11.317 ft or above 34.0
18 ft to 19 ft22.718 ft or above 22.7