Potomac River at Point of Rocks, Frederick County MD (PORM2)
Gage Location: Frederick County, MarylandSite Location: Frederick County, Maryland
Latitude: 39.274Longitude: -77.543Elevation: 200.63 ft. MSLDrainage Area: 9651 Sq. Mi.
Minor Stage: 16 ft. Moderate Stage: 20 ft.Major Stage: 25 ft.
First Flood: 1889-06-02Last Flood: 2012-10-31 Crest: 18.19 ft.Datum change: 1929-10-28Number of Floods: 114

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Year
Before Datum Change
Number of Floods
18891
18900
18910
18920
18930
18940
18950
18961
18970
18981
18991
19000
19011
19021
19031
19040
19050
19060
19071
19081
19090
19101
19111
19120
19131
19140
19151
19161
19171
19181
19190
19201
19210
19220
19230
19241
19250
19260
19270
19281
Year
After Datum Change
Number of Floods
19292
19300
19310
19321
19331
19341
19350
19362
19372
19380
19391
19400
19410
19423
19430
19440
19451
19460
19470
19481
19491
19502
19511
19523
19530
19542
19551
19560
19570
19580
19590
19603
19612
19621
19632
19641
19651
19660
19671
19680
19690
19701
19710
19722
19732
19740
19752
19762
19770
19784
19793
19800
19810
19821
19831
19843
19851
19861
19871
19881
19890
19900
19910
19921
19935
19943
19950
19964
19971
19984
19990
20000
20010
20020
20035
20041
20051
20060
20071
20081
20091
20102
20113
20121
20130