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Patapsco River at Hollofield

Highest listed crest 31.30 ftFlood stage 11.0 ft20 crests since 1933

The Patapsco River at Hollofield crested at major flood stage 1 time among the 20 crests the National Weather Service lists from 1933 to 2018. The highest, 31.30 ft on June 22, 1972, was major flooding, 20.30 feet above flood stage.

The gauge

Highest listed crest
31.30 ft
June 22, 1972; 80,600 cubic feet per second
Flood stage
11.0 ft
Major flooding from 25.0 ft
Crests at major
1
32nd of 108 gauges in Maryland
Most recent flood crest
July 31, 2016
14.24 ft, minor flooding
Location
Baltimore County
Near Baltimore (9.8 mi)

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Patapsco River at Hollofield
Action stage9.010Jun 3, 2018The level at which the NWS or its partners begin to take action
Flood stage (minor)11.07Jul 31, 2016Minimal or no property damage, but possibly some public threat
Moderate flood stage19.02Sep 26, 1975Some inundation of structures and roads near the stream
Major flood stage25.01Jun 22, 1972Extensive inundation of structures and roads

Every listed crest

20 crests from 1933 to 2018. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Patapsco River at Hollofield, 1933 to 2018 010203040ft Flood stage 11.0 ftMajor 25.0 ft Aug 1, 1933: 19.50 ft, moderate flooding; 36,000 cubic feet per secondJul 18, 1945: 9.01 ft, action stage; 9,700 cubic feet per secondJun 2, 1946: 11.62 ft, minor flooding; 13,500 cubic feet per secondApr 27, 1952: 9.76 ft, action stage; 11,000 cubic feet per secondMay 26, 1952: 10.69 ft, action stage; 12,300 cubic feet per secondSep 1, 1952: 9.25 ft, action stage; 10,000 cubic feet per secondNov 22, 1952: 9.72 ft, action stage; 10,800 cubic feet per secondJul 21, 1956: 15.88 ft, minor flooding; 19,000 cubic feet per secondSep 12, 1971: 11.01 ft, minor flooding; 12,700 cubic feet per secondJun 22, 1972: 31.30 ft, major flooding; 80,600 cubic feet per secondSep 26, 1975: 22.80 ft, moderate flooding; 46,500 cubic feet per secondSep 6, 1979: 9.51 ft, action stage; 10,500 cubic feet per secondOct 1, 1979: 9.20 ft, action stage; 9,900 cubic feet per secondMay 6, 1989: 10.22 ft, action stage; 11,800 cubic feet per secondDec 11, 2003: 11.62 ft, minor flooding; 14,800 cubic feet per secondSep 7, 2011: 12.62 ft, minor flooding; 18,700 cubic feet per secondJan 31, 2013: 10.85 ft, action stage; 14,400 cubic feet per secondApr 30, 2014: 13.25 ft, minor flooding; 20,300 cubic feet per secondJul 31, 2016: 14.24 ft, minor flooding; 22,800 cubic feet per secondJun 3, 2018: 9.87 ft, action stage; 12,100 cubic feet per second Highest, 31.30 ft, Jun 22, 1972 1940196019802000

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Patapsco River at Hollofield 1930s: 1 1940s: 1 1950s: 1 1960s: 0 1970s: 3 3 1980s: 0 1990s: 0 2000s: 1 2010s: 3 1930s1940s1950s1960s1970s1980s1990s2000s2010s
  1. These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
  2. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.

Highest crests

Highest listed crests, Patapsco River at Hollofield
1Jun 22, 197231.30+20.30Major80,600
2Sep 26, 197522.80+11.80Moderate46,500
3Aug 1, 193319.50+8.50Moderate36,000
4Jul 21, 195615.88+4.88Minor19,000
5Jul 31, 201614.24+3.24Minor22,800
6Apr 30, 201413.25+2.25Minor20,300
7Sep 7, 201112.62+1.62Minor18,700
8Jun 2, 194611.62+0.62Minor13,500
9Dec 11, 200311.62+0.62Minor14,800
10Sep 12, 197111.01+0.01Minor12,700
11Jan 31, 201310.85−0.15Action14,400
12May 26, 195210.69−0.31Action12,300
13May 6, 198910.22−0.78Action11,800
14Jun 3, 20189.87−1.13Action12,100
15Apr 27, 19529.76−1.24Action11,000
16Nov 22, 19529.72−1.28Action10,800
17Sep 6, 19799.51−1.49Action10,500
18Sep 1, 19529.25−1.75Action10,000
19Oct 1, 19799.20−1.80Action9,900
20Jul 18, 19459.01−1.99Action9,700

The worst floods along the Patapsco River

For this gauge's highest crests, the other gauges on the Patapsco River that crested above flood stage within a week.

July 31, 2016: 14.24 ft here, minor flooding

Gauges on the Patapsco River

Flood gauges sharing the river's name, linked within 80 miles of one another.

Flood gauges on the Patapsco River
Ellicott CityMD122.5124.78 ft, May 27, 20180
Hollofield this gaugeMD11.031.30 ft, Jun 22, 19721
CatonsvilleMD20.027.15 ft, May 27, 20180
Elkridge at Patapsco Valley State ParkMD15.024.76 ft, May 27, 20184
Elkridge below Patapsco Valley State ParkMD16.021.38 ft, Aug 4, 20180

Other gauges in Baltimore County

Flood gauges in Baltimore County
Broadmoor4.06.08 ft, Jun 22, 19720
Cockeysville9.012.10 ft, Jul 1, 19847
Bentley Springs5.57.30 ft, Jul 25, 20180
Woodlawn10.012.24 ft, Jul 30, 20160
Franklintown10.012.50 ft, Jun 22, 19720
Woodlawn9.012.16 ft, Jul 30, 20160
Catonsville9.011.29 ft, Jul 30, 20160
Arbutus7.013.25 ft, Aug 26, 19991
Beckleysville7.07.27 ft, Jul 24, 20180
Beckleysville6.07.85 ft, Jul 23, 20180
Glencoe7.016.50 ft, Sep 8, 20119
Hoffmanville6.010.02 ft, Aug 28, 20091
Parkton10.011.62 ft, Sep 8, 20110
Villa Nova11.021.50 ft, Jun 22, 19721
White Marsh6.013.51 ft, Oct 19, 20240
Sorrento17.018.11 ft, Jun 22, 19720
Blue Mount8.518.54 ft, Jun 22, 19724
Laurel Brook7.511.40 ft, Jul 1, 19840
Glen Arm10.011.15 ft, Jul 14, 20150
Ellicott City122.5124.78 ft, May 27, 20180
Catonsville20.027.15 ft, May 27, 20180
Dover8.510.86 ft, Jul 24, 20180
Rockdale7.07.83 ft, Jul 31, 20160
Woodlawn7.08.15 ft, Jul 30, 20160
Middle River10.813.06 ft, Aug 7, 20180
Idlewylde9.010.87 ft, Aug 14, 20120
Western Run8.026.00 ft, Jun 22, 19723
White Marsh11.018.49 ft, Aug 1, 19711

Baltimore County: every hazard · River floods across the country · Maryland

NOAA National Water Prediction Service, gauge PRHM2, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.