Waterlands
Marsh Run
USGS · 01617800
MARSH RUN
USGS · 01617800LIVE

MARSH RUN AT GRIMES, MD

WASHINGTON COUNTY, MD39.5146°N, -77.7772°W Updated 7 hr ago
FLOW RATE
7cfs
GAUGE HT
1.09ft
AIR TEMP
72°F
WIND
4mph N
FISH INDEX
69SCORE / 100
GREAT · 4 OF 5
Flow Rate Historical Avg
MEDIAN FLOW RATE · 1 YEAR
7cfs 43.9% vs avg
Optimal band: 68 cfs
PERIOD HIGH
31cfs
PERIOD LOW
3cfs
RUNNABLE
27%
last 1 year in band

Gauge Height

1.09ft
Precipitation History

Precipitation · YTD

Normal

Near-normal year

2026 to date

21.2in

≈ normal

21.19 in of precipitation so far this year — about average for this point in the season (normal 21.18 in).

YTD Total

21.2in

This year so far

Normal to Date

21.2in

30-yr average

Typical Range

16.5–26.7in

10th–90th pct YTD

Departure

0%

vs 30-yr normal

By Month

This year
Typical range
Normal
Jan: 2.38" · normal 3.03" (1.6–4.9)
Jan
Feb: 2.18" · normal 2.66" (1.3–4.9)
Feb
Mar: 3.55" · normal 3.77" (1.7–5.2)
Mar
Apr: 1.94" · normal 3.45" (2.0–5.3)
Apr
May: 5.08" · normal 3.69" (1.4–5.6)
May
Jun: 3.08" · normal 3.36" (1.7–5.5)
Jun
Jul: 2.99" (so far)· normal 3.36" (1.8–5.3)
Jul
Aug: normal 2.77" (1.5–4.2)
Aug
Sep: normal 4.12" (1.2–7.8)
Sep
Oct: normal 3.27" (0.8–5.5)
Oct
Nov: normal 2.92" (1.3–4.4)
Nov
Dec: normal 3.34" (1.7–4.9)
Dec
Baseline 19912020 · Source: Open-Meteo06:38 UTC
Your History · MARSH RUN AT GRIMES, MD

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Weather Conditions
WEATHER CONDITIONS
TODAY
84°
70°
MON
84°
65°
TUE
90°
61°
WED
100°
67°
THU
93°
73°
FRI
86°
67°
SAT
79°
64°
TIME
SUN
8
NOW
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
MON
12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
TUE
12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
WED
12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
THU
12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
FRI
12
am
1
am
2
am
TEMP
hourly forecast
75°
mild
75°
77°
78°
78°
79°
81°
82°
84°
84°
84°
83°
82°
79°
75°
74°
72°
71°
70°
69°
68°
67°
66°
65°
66°
71°
74°
77°
79°
81°
82°
83°
84°
84°
84°
84°
81°
77°
72°
71°
69°
66°
65°
64°
62°
61°
61°
61°
64°
68°
73°
77°
81°
84°
86°
88°
89°
90°
90°
89°
85°
80°
76°
73°
72°
70°
69°
68°
67°
67°
67°
67°
69°
74°
79°
83°
87°
92°
96°
98°
100°
100°
98°
96°
93°
87°
82°
81°
79°
78°
76°
75°
74°
74°
73°
73°
75°
79°
83°
85°
89°
90°
90°
91°
93°
93°
92°
89°
84°
80°
78°
77°
76°
74°
72°
70°
WIND
mph · gust · dir
6mph NE
G 13 mph
6
G13
NE
6
G10
ENE
6
G9
E
8
G10
ESE
7
G10
ESE
7
G9
ESE
7
G9
ESE
7
G9
ESE
8
G10
ESE
10
G12
ESE
9
G13
ESE
8
G13
ESE
6
G16
ESE
5
G9
SE
4
G9
SE
5
G10
SE
4
G8
ESE
4
G8
ESE
4
G7
ESE
4
G5
ESE
3
G5
E
4
G5
E
4
NE
2
G4
ENE
5
G12
SE
5
G9
SE
6
G9
SE
6
G10
SE
8
G11
SE
8
G11
SE
7
G9
ESE
7
G9
ESE
7
G9
ESE
7
G9
ESE
7
G8
ESE
6
G10
ESE
5
G7
ESE
5
ESE
5
E
7
G8
SSE
5
SE
4
G5
SSW
5
SSW
2
G3
SSE
2
G3
SSW
1
NW
1
W
1
ESE
2
SW
4
SW
4
SW
5
G6
SSW
5
G6
SSW
6
SSW
6
S
7
S
7
S
8
S
8
S
7
G10
SSE
7
S
7
G8
S
7
G10
SSW
6
G7
SW
4
SW
5
SSW
4
G5
SSW
2
G3
SW
2
WSW
4
WSW
4
WSW
5
SW
5
G7
WSW
7
G13
W
10
G15
NW
11
G15
WNW
10
G14
W
9
G13
WNW
9
G12
WNW
10
G12
NW
12
G13
NW
13
G14
NW
13
G16
NW
12
G20
NW
8
G18
NW
7
G17
NW
7
G12
NW
7
G15
NW
6
G8
NW
4
WNW
4
W
3
W
4
W
4
W
4
W
3
W
5
G9
W
10
G18
NW
11
G18
WNW
12
G18
NW
14
G18
NNW
17
G20
NNW
15
G20
NW
13
G20
NW
15
G20
NW
17
G19
NW
15
G19
NW
15
G25
NW
12
G25
NW
10
G24
NW
9
G23
NW
8
G20
NNW
7
G16
NNW
6
G11
NNW
5
G7
NNW
PRECIP
chance %
1%
1%
0%
0%
0%
0%
0%
2%
4%
4%
6%
5%
3%
5%
1%
1%
1%
2%
1%
1%
1%
0%
0%
0%
0%
0%
0%
0%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
1%
1%
1%
1%
1%
1%
4%
4%
4%
4%
4%
4%
2%
2%
2%
2%
2%
2%
1%
1%
1%
1%
1%
1%
3%
3%
3%
3%
3%
3%
5%
5%
5%
5%
5%
5%
CLOUDS
cover %
14%
few
14%
17%
100%
100%
100%
100%
100%
91%
100%
100%
100%
84%
100%
83%
48%
0%
1%
8%
11%
0%
0%
0%
10%
5%
1%
0%
0%
0%
0%
0%
0%
1%
3%
0%
0%
2%
7%
4%
0%
0%
1%
0%
0%
0%
0%
0%
0%
0%
6%
100%
100%
50%
6%
5%
5%
5%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
6%
7%
7%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
5%
5%
5%
6%
5%
100%
100%
100%
100%
100%
100%
10%
61%
100%
84%
94%
85%
76%
22%
64%
100%
100%
98%
86%
78%
83%
93%
100%
PRESSURE
hPa · trend
1006
10061006100610071008100710061006100810051002100110029999989989999989991001
TemperatureWind / GustsPrecipitationCloud coverPressure
Nowscroll →
FISH INDEX
69
Temperature
Warm
Wind
Calm
Pressure
Rising — Slow
Moon Phase
Average
DAYLIGHT
SUNRISE
05:54 AM
SUNSET
08:39 PM
14H 45M OF DAYLIGHT
MOON PHASE
Waning Crescent
7% illuminated

Station Location

39.5146, -77.7772
Loading map…
DATA · USGS · NOAA · NWSUPDATED 2026-07-12 00:00 UTC
Site #01617800·USGS

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