About this river
Monocacy River is a 20.6 mile river near River Island Outfitters in Maryland. Streamflow is measured at the USGS gauge Monocacy River near Dickerson, MD (site 01643580). The National Hydrography Dataset places it at stream order 7. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
2023 to 2026
Monocacy River typically runs highest in February, at a median 1,060 cfs, and lowest in September, at 160 cfs. The highest flow on record for any single day is 18,900 cfs, in 2024.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 270 | 196 to 1,400 | |
| February | 1,060 | 177 to 1,385 | |
| March | 995 | 497 to 1,820 | |
| April | 699 | 540 to 1,440 | |
| May | 1,030 | 342 to 2,090 | |
| June | 360 | 294 to 1,090 | |
| July | 300 | 169 to 557 | |
| August | 245 | 123 to 412 | |
| September | 160 | 118 to 275 | |
| October | 160 | 134 to 251 | |
| November | 198 | 123 to 245 | |
| December | 434 | 233 to 728 |
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 3 years of record. Statistics published by the US Geological Survey for Monocacy River near Dickerson, MD (site 01643580). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
One mapped launch sits in the mapped area of Monocacy River. Ramp data comes from the USGS national boat-ramp inventory.
- MonocacyMonocacy RiverPublic
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Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Monocacy 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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