Patapsco River at Ellicott City
Highest listed crest 124.78 ftFlood stage 122.5 ft2 crests since 2018
The Patapsco River at Ellicott City crested above flood stage 2 times among the 2 crests the National Weather Service lists from 2018 to 2018. The highest, 124.78 ft on May 27, 2018, was minor flooding, 2.28 feet above flood stage. 2 other gauges on the Patapsco River crested above flood stage within a week of it, 2 at their own highest listed crest.
The gauge
- Highest listed crest
- 124.78 ft
- May 27, 2018
- Flood stage
- 122.5 ft
- Major flooding from 127.0 ft
- Crests at major
- 0
- 2 above flood stage
- Most recent flood crest
- June 4, 2018
- 122.60 ft, minor flooding
Flood stages
The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.
| Action stage | 121.5 | 0 | — |
| Flood stage (minor) | 122.5 | 2 | Jun 4, 2018 |
| Moderate flood stage | 125.0 | 0 | — |
| Major flood stage | 127.0 | 0 | — |
Every listed crest
2 crests from 2018 to 2018. Filled: at or above flood stage. Hover a crest for its date and stage.
- 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.
- 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
| 1 | May 27, 2018 | 124.78 | +2.28 | Minor |
| 2 | Jun 4, 2018 | 122.60 | +0.10 | Minor |
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.
May 27, 2018: 124.78 ft here, minor flooding
- Elkridge at Patapsco Valley State ParkMD · May 27, 2018 · 24.76 ft · Major · its highest
- CatonsvilleMD · May 27, 2018 · 27.15 ft · Moderate · its highest
June 4, 2018: 122.60 ft here, minor flooding
- CatonsvilleMD · Jun 4, 2018 · 22.17 ft · Minor
- Elkridge at Patapsco Valley State ParkMD · Jun 4, 2018 · 18.01 ft · Minor
Gauges on the Patapsco River
Flood gauges sharing the river's name, linked within 80 miles of one another.
| Ellicott City this gauge | MD | 124.78 ft, May 27, 2018 | 0 |
| Hollofield | MD | 31.30 ft, Jun 22, 1972 | 1 |
| Catonsville | MD | 27.15 ft, May 27, 2018 | 0 |
| Elkridge at Patapsco Valley State Park | MD | 24.76 ft, May 27, 2018 | 4 |
| Elkridge below Patapsco Valley State Park | MD | 21.38 ft, Aug 4, 2018 | 0 |
Other gauges in Baltimore County
| Broadmoor | 6.08 ft, Jun 22, 1972 | 0 |
| Cockeysville | 12.10 ft, Jul 1, 1984 | 7 |
| Bentley Springs | 7.30 ft, Jul 25, 2018 | 0 |
| Woodlawn | 12.24 ft, Jul 30, 2016 | 0 |
| Franklintown | 12.50 ft, Jun 22, 1972 | 0 |
| Woodlawn | 12.16 ft, Jul 30, 2016 | 0 |
| Catonsville | 11.29 ft, Jul 30, 2016 | 0 |
| Arbutus | 13.25 ft, Aug 26, 1999 | 1 |
| Beckleysville | 7.27 ft, Jul 24, 2018 | 0 |
| Beckleysville | 7.85 ft, Jul 23, 2018 | 0 |
| Glencoe | 16.50 ft, Sep 8, 2011 | 9 |
| Hoffmanville | 10.02 ft, Aug 28, 2009 | 1 |
| Parkton | 11.62 ft, Sep 8, 2011 | 0 |
| Villa Nova | 21.50 ft, Jun 22, 1972 | 1 |
| White Marsh | 13.51 ft, Oct 19, 2024 | 0 |
| Sorrento | 18.11 ft, Jun 22, 1972 | 0 |
| Blue Mount | 18.54 ft, Jun 22, 1972 | 4 |
| Laurel Brook | 11.40 ft, Jul 1, 1984 | 0 |
| Glen Arm | 11.15 ft, Jul 14, 2015 | 0 |
| Hollofield | 31.30 ft, Jun 22, 1972 | 1 |
| Catonsville | 27.15 ft, May 27, 2018 | 0 |
| Dover | 10.86 ft, Jul 24, 2018 | 0 |
| Rockdale | 7.83 ft, Jul 31, 2016 | 0 |
| Woodlawn | 8.15 ft, Jul 30, 2016 | 0 |
| Middle River | 13.06 ft, Aug 7, 2018 | 0 |
| Idlewylde | 10.87 ft, Aug 14, 2012 | 0 |
| Western Run | 26.00 ft, Jun 22, 1972 | 3 |
| White Marsh | 18.49 ft, Aug 1, 1971 | 1 |
Baltimore County: every hazard · River floods across the country · Maryland
NOAA National Water Prediction Service, gauge ELPM2, 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.