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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: 4:18 AM EST 12/11/25

Status: No Flooding

Stage: 0.16 ft

Flow: -999 kcfs

Forecast

TimeStage (ft)Flow (kcfs)
5 AM 12/11 0.6 -999
6 AM 12/11 0.3 -999
7 AM 12/11 0.2 -999
8 AM 12/11 0.2 -999
9 AM 12/11 0.3 -999
10 AM 12/11 0.3 -999
11 AM 12/11 0.4 -999
12 PM 12/11 0.4 -999
1 PM 12/11 0.3 -999
2 PM 12/11 0 -999
3 PM 12/11 -0.2 -999
4 PM 12/11 -0.4 -999
5 PM 12/11 -0.6 -999
6 PM 12/11 -0.5 -999
7 PM 12/11 -0.5 -999
8 PM 12/11 -0.4 -999
9 PM 12/11 -0.1 -999
10 PM 12/11 0.2 -999
11 PM 12/11 0.4 -999
12 AM 12/12 0.6 -999
1 AM 12/12 0.5 -999
2 AM 12/12 0.5 -999
3 AM 12/12 0.3 -999
4 AM 12/12 0.1 -999
5 AM 12/12 -0.1 -999
6 AM 12/12 -0.2 -999
7 AM 12/12 -0.2 -999
8 AM 12/12 -0.2 -999
9 AM 12/12 0 -999
10 AM 12/12 0.2 -999
11 AM 12/12 0.5 -999
12 PM 12/12 0.7 -999
1 PM 12/12 0.8 -999
2 PM 12/12 0.8 -999
3 PM 12/12 0.6 -999
4 PM 12/12 0.5 -999
5 PM 12/12 0.3 -999
6 PM 12/12 0.2 -999
7 PM 12/12 0 -999
8 PM 12/12 0.1 -999
9 PM 12/12 0.2 -999
10 PM 12/12 0.3 -999
11 PM 12/12 0.5 -999
12 AM 12/13 0.7 -999
1 AM 12/13 0.8 -999
2 AM 12/13 0.7 -999
3 AM 12/13 0.6 -999
4 AM 12/13 0.4 -999
5 AM 12/13 0.2 -999
6 AM 12/13 0 -999
7 AM 12/13 -0.1 -999
8 AM 12/13 -0.1 -999
9 AM 12/13 0 -999
10 AM 12/13 0.2 -999
11 AM 12/13 0.5 -999
12 PM 12/13 0.6 -999
1 PM 12/13 0.8 -999
TimeStage (ft)Flow (kcfs)
4:18 AM 12/11 0.16 -999
4:12 AM 12/11 0.13 -999
4:06 AM 12/11 0.11 -999
4:00 AM 12/11 0.14 -999
3:54 AM 12/11 0.16 -999
3:48 AM 12/11 0.15 -999
3:42 AM 12/11 0.19 -999
3:36 AM 12/11 0.22 -999
3:30 AM 12/11 0.26 -999
3:24 AM 12/11 0.32 -999
3:18 AM 12/11 0.39 -999
3:12 AM 12/11 0.46 -999
3:06 AM 12/11 0.51 -999
3:00 AM 12/11 0.56 -999
2:54 AM 12/11 0.58 -999
2:48 AM 12/11 0.63 -999
2:42 AM 12/11 0.69 -999
2:36 AM 12/11 0.74 -999
2:30 AM 12/11 0.82 -999
2:24 AM 12/11 0.88 -999
2:18 AM 12/11 0.94 -999
2:12 AM 12/11 0.99 -999
2:06 AM 12/11 1.03 -999
2:00 AM 12/11 1.08 -999
1:54 AM 12/11 1.12 -999
1:48 AM 12/11 1.18 -999
1:42 AM 12/11 1.22 -999
1:36 AM 12/11 1.28 -999
1:30 AM 12/11 1.32 -999
1:24 AM 12/11 1.33 -999
Hydrograph for Northwest Branch Patapsco River at Baltimore/Fort McHenry (IN MLLW)
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.
DateStage (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.