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Northwest Branch Patapsco River at Baltimore/Fort McHenry (IN MLLW)
Critical Stages
2.5' - Action
3.4' - Flood
4.6' - Moderate
6' - Major
Latest Observation
Updated: 3:48 AM EST 12/15/25
Status: No Flooding
Stage: -1.32 ft
Flow: -999 kcfs
Forecast
| Time | Stage (ft) | Flow (kcfs) |
|---|---|---|
| 5 AM 12/15 | -1.5 | -999 |
| 6 AM 12/15 | -1.6 | -999 |
| 7 AM 12/15 | -1.8 | -999 |
| 8 AM 12/15 | -1.9 | -999 |
| 9 AM 12/15 | -1.9 | -999 |
| 10 AM 12/15 | -1.7 | -999 |
| 11 AM 12/15 | -1.4 | -999 |
| 12 PM 12/15 | -1.1 | -999 |
| 1 PM 12/15 | -0.8 | -999 |
| 2 PM 12/15 | -0.4 | -999 |
| 3 PM 12/15 | -0.2 | -999 |
| 4 PM 12/15 | 0 | -999 |
| 5 PM 12/15 | 0 | -999 |
| 6 PM 12/15 | -0.1 | -999 |
| 7 PM 12/15 | -0.3 | -999 |
| 8 PM 12/15 | -0.4 | -999 |
| 9 PM 12/15 | -0.5 | -999 |
| 10 PM 12/15 | -0.6 | -999 |
| 11 PM 12/15 | -0.6 | -999 |
| 12 AM 12/16 | -0.5 | -999 |
| 1 AM 12/16 | -0.2 | -999 |
| 2 AM 12/16 | 0 | -999 |
| 3 AM 12/16 | 0.2 | -999 |
| 4 AM 12/16 | 0.4 | -999 |
| 5 AM 12/16 | 0.3 | -999 |
| 6 AM 12/16 | 0.1 | -999 |
| 7 AM 12/16 | 0 | -999 |
| 8 AM 12/16 | -0.1 | -999 |
| 9 AM 12/16 | -0.1 | -999 |
| 10 AM 12/16 | -0.2 | -999 |
| 11 AM 12/16 | 0 | -999 |
| 12 PM 12/16 | 0.3 | -999 |
| 1 PM 12/16 | 0.7 | -999 |
| 2 PM 12/16 | 1 | -999 |
| 3 PM 12/16 | 1.2 | -999 |
| 4 PM 12/16 | 1.4 | -999 |
| 5 PM 12/16 | 1.4 | -999 |
| 6 PM 12/16 | 1.2 | -999 |
| 7 PM 12/16 | 1.1 | -999 |
| 8 PM 12/16 | 0.9 | -999 |
| 9 PM 12/16 | 0.7 | -999 |
| 10 PM 12/16 | 0.4 | -999 |
| 11 PM 12/16 | 0.3 | -999 |
| 12 AM 12/17 | 0.2 | -999 |
| 1 AM 12/17 | 0.3 | -999 |
| 2 AM 12/17 | 0.4 | -999 |
| 3 AM 12/17 | 0.6 | -999 |
| 4 AM 12/17 | 0.7 | -999 |
| 5 AM 12/17 | 0.6 | -999 |
| 6 AM 12/17 | 0.5 | -999 |
| 7 AM 12/17 | 0.3 | -999 |
| 8 AM 12/17 | 0.1 | -999 |
| 9 AM 12/17 | 0 | -999 |
| 10 AM 12/17 | -0.1 | -999 |
| 11 AM 12/17 | -0.1 | -999 |
| 12 PM 12/17 | 0.1 | -999 |
| 1 PM 12/17 | 0.4 | -999 |
| 2 PM 12/17 | 0.6 | -999 |
| 3 PM 12/17 | 0.9 | -999 |
| 4 PM 12/17 | 1.1 | -999 |
| 5 PM 12/17 | 1.2 | -999 |
| 6 PM 12/17 | 1.2 | -999 |
| 7 PM 12/17 | 0.9 | -999 |
| 8 PM 12/17 | 0.7 | -999 |
| 9 PM 12/17 | 0.5 | -999 |
| 10 PM 12/17 | 0.2 | -999 |
| 11 PM 12/17 | 0 | -999 |
| 12 AM 12/18 | -0.2 | -999 |
| 1 AM 12/18 | -0.2 | -999 |
| 2 AM 12/18 | -0.4 | -999 |
| Time | Stage (ft) | Flow (kcfs) |
|---|---|---|
| 4:06 AM 12/15 | -1.37 | -999 |
| 4:00 AM 12/15 | -1.37 | -999 |
| 3:54 AM 12/15 | -1.34 | -999 |
| 3:48 AM 12/15 | -1.32 | -999 |
| 3:42 AM 12/15 | -1.34 | -999 |
| 3:36 AM 12/15 | -1.32 | -999 |
| 3:30 AM 12/15 | -1.31 | -999 |
| 3:24 AM 12/15 | -1.31 | -999 |
| 3:18 AM 12/15 | -1.28 | -999 |
| 3:12 AM 12/15 | -1.28 | -999 |
| 3:06 AM 12/15 | -1.29 | -999 |
| 3:00 AM 12/15 | -1.29 | -999 |
| 2:54 AM 12/15 | -1.33 | -999 |
| 2:48 AM 12/15 | -1.32 | -999 |
| 2:42 AM 12/15 | -1.33 | -999 |
| 2:36 AM 12/15 | -1.35 | -999 |
| 2:30 AM 12/15 | -1.35 | -999 |
| 2:24 AM 12/15 | -1.35 | -999 |
| 2:18 AM 12/15 | -1.35 | -999 |
| 2:12 AM 12/15 | -1.36 | -999 |
| 2:06 AM 12/15 | -1.38 | -999 |
| 2:00 AM 12/15 | -1.42 | -999 |
| 1:54 AM 12/15 | -1.45 | -999 |
| 1:48 AM 12/15 | -1.44 | -999 |
| 1:42 AM 12/15 | -1.45 | -999 |
| 1:36 AM 12/15 | -1.46 | -999 |
| 1:30 AM 12/15 | -1.47 | -999 |
| 1:24 AM 12/15 | -1.51 | -999 |
| 1:18 AM 12/15 | -1.53 | -999 |
| 1:12 AM 12/15 | -1.52 | -999 |
6.5' -
Water approaches Caroline Street.
6' -
Water reaches the corner of Ann Street and Thames Street.
5.5' -
Water begins to cover the Pier 4 promenade on the west side and Pier 5 on the west side.
5.25' -
The boardwalk at Fells Point begins to flood. Water also begins to cover low spots in the promenade at the end of Broadway Street.
5' -
Water begins to cover the Pier 4 promenade on the east side.
4.5' -
The end of Ann Street begins to flood.
4.25' -
The concrete promenade at Fells Point begins to flood. Water also begins to cover the boardwalk at the Maritime Park water taxi stop.
3.5' -
Water begins to cover the promenade at the Inner Harbor at the electric boat dock west of the World Trade Center. A half foot of water covers parts of Thames Street in the Fells Point area.
3' -
Flooding is occurring at the end of Thames Street. Water also nearly covers the promenade at the dragon boat dock in the Inner Harbor.
2' -
Water begins to cover the lower promenade at the Harbor Place water taxi stop.
| Date | Stage (ft) |
|---|---|
| Aug 13, 2025 | 9.77 |
| Sep 19, 2003 | 8.15 |
| Aug 23, 1933 | 7.69 |
| Aug 13, 1955 | 6.39 |
| May 28, 2025 | 5.85 |
| Oct 15, 1954 | 5.5 |
| Dec 16, 2022 | 5.31 |
| Aug 4, 1915 | 5.3 |
| Sep 6, 1979 | 5.18 |
| Sep 7, 1996 | 5.16 |
| Nov 4, 1985 | 5.13 |
| Oct 30, 2021 | 4.92 |
| Nov 25, 1950 | 4.89 |
| Sep 1, 1952 | 4.69 |
| Apr 30, 2020 | 4.24 |
| Apr 13, 2020 | 4.17 |
| Oct 12, 2019 | 4.16 |
| Oct 12, 2019 | 4.05 |
| Mar 7, 2018 | 3.89 |
| Sep 21, 2018 | 3.85 |
Data provided by the National Weather Service.
