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Around South Branch Patapsco River
Data Source: Recreation.gov · Public land: USGS PAD-US
About this river
South Branch Patapsco River is a 13.4 mile river near Black Hill Boat Rental in Maryland. Streamflow is measured at the USGS gauge Patapsco River at Hollofield, MD (site 01589000). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1944 to 2026
South Branch Patapsco River typically runs highest in March, at a median 210 cfs, and lowest in September, at 56 cfs. The highest flow on record for any single day is 30,000 cfs, in 1972.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 132 | 78 to 251 |
| February | 151 | 107 to 319 |
| March | 210 | 118 to 348 |
| April | 194 | 119 to 350 |
| May | 169 | 100 to 303 |
| June | 114 | 71 to 228 |
| July | 76 | 49 to 150 |
| August | 65 | 40 to 124 |
| September | 56 | 34 to 103 |
| October | 60 | 42 to 119 |
| November | 83 | 55 to 156 |
| December | 106 | 67 to 224 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 70 years of record. Statistics published by the US Geological Survey for Patapsco River at Hollofield, MD (site 01589000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show South Branch Patapsco River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
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