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: 2013-01-31 Crest: 12.49 ft.Datum change: 1927-09-14Number of Floods: 81

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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 ft2228.211 ft or above 78100.0
12 ft to 13 ft1924.412 ft or above 5671.8
13 ft to 14 ft1417.913 ft or above 3747.4
14 ft to 15 ft1316.714 ft or above 2329.5
15 ft to 16 ft33.815 ft or above 1012.8
16 ft to 17 ft45.116 ft or above 79.0
17 ft to 18 ft11.317 ft or above 33.8
18 ft to 19 ft22.618 ft or above 22.6
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 ft2229.711 ft or above 74100.0
12 ft to 13 ft1824.312 ft or above 5270.3
13 ft to 14 ft1317.613 ft or above 3445.9
14 ft to 15 ft1114.914 ft or above 2128.4
15 ft to 16 ft34.115 ft or above 1013.5
16 ft to 17 ft45.416 ft or above 79.5
17 ft to 18 ft11.417 ft or above 34.1
18 ft to 19 ft22.718 ft or above 22.7