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

MARSH RUN AT GRIMES, MD

WASHINGTON COUNTY, MD39.5146°N, -77.7772°W Updated 6 hr ago
FLOW RATE
6cfs
AIR TEMP
78°F
WIND
4mph SSW
FISH INDEX
69SCORE / 100
GREAT · 4 OF 5
Flow Rate Historical Avg
MEDIAN FLOW RATE · 30 DAY
6cfs 31.6% vs avg
Optimal band: 810 cfs
PERIOD HIGH
11cfs
PERIOD LOW
6cfs
RUNNABLE
71%
last 30 day in band
Precipitation History

Precipitation · YTD

Normal

Near-normal year

2026 to date

18.2in

≈ normal

18.21 in of precipitation so far this year — about average for this point in the season (normal 20.16 in).

YTD Total

18.2in

This year so far

Normal to Date

20.2in

30-yr average

Typical Range

15.5–25.7in

10th–90th pct YTD

Departure

-10%

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: 0.00" (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-Meteo06:15 AM
Your History · MARSH RUN AT GRIMES, MD

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Weather Conditions
WEATHER CONDITIONS
TODAY
103°
74°
FRI
105°
78°
SAT
99°
74°
SUN
95°
68°
MON
88°
67°
TUE
79°
68°
WED
76°
65°
TIME
THU
6
NOW
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
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
SAT
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
SUN
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
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
TEMP
hourly forecast
74°
mild
74°
77°
83°
87°
91°
94°
97°
99°
101°
103°
103°
103°
103°
102°
97°
92°
89°
87°
85°
84°
82°
81°
79°
78°
78°
80°
86°
91°
95°
98°
100°
102°
104°
105°
105°
104°
97°
97°
92°
86°
82°
78°
78°
77°
77°
76°
75°
75°
74°
77°
79°
84°
87°
91°
94°
97°
99°
99°
99°
99°
98°
92°
80°
74°
75°
75°
74°
71°
70°
69°
69°
70°
70°
73°
76°
80°
84°
88°
90°
93°
95°
94°
89°
91°
69°
70°
70°
68°
69°
68°
68°
68°
67°
67°
67°
67°
67°
69°
71°
72°
75°
79°
81°
84°
86°
87°
88°
87°
80°
76°
74°
72°
71°
71°
70°
70°
WIND
mph · gust · dir
2mph SSE
G 3 mph
2
G3
SSE
2
G3
S
4
G11
W
5
G14
NW
5
G10
WNW
7
G10
WNW
7
G9
WNW
7
G10
WNW
7
G10
WNW
7
G13
WNW
8
G14
W
8
G13
W
10
G13
WNW
10
G14
WNW
7
G15
WNW
6
G13
WNW
5
G14
W
5
G13
W
2
G10
W
5
G7
S
4
G7
S
2
G5
SSE
2
ESE
3
SSE
3
ESE
3
G4
S
2
G4
WSW
3
G11
NNW
5
G10
NNW
7
G11
NNW
6
G12
NW
7
G11
W
5
G16
WNW
8
G16
WNW
10
G16
NW
10
G14
NNW
11
G14
SW
8
G13
WSW
7
G21
WNW
6
G35
NNW
6
SW
7
SSW
5
G6
SSW
2
G6
SW
2
G4
WSW
3
G4
W
3
G5
W
3
G4
W
4
G19
W
4
G12
WNW
6
G7
WNW
6
G9
WNW
6
G7
WNW
8
WNW
8
G9
NW
8
G9
NW
10
WNW
13
WNW
12
G14
WNW
9
G14
NW
11
G17
NW
9
G34
SW
8
G28
S
4
SSE
1
G2
SE
2
SW
3
SSW
4
S
5
SSE
2
SE
5
S
1
G2
WSW
2
NNW
3
N
3
N
3
N
4
NNE
5
NE
5
ENE
4
G6
ESE
5
G9
ESE
6
G9
ESE
7
G10
E
7
G8
S
25
WNW
5
G25
WSW
12
G25
WNW
1
G14
W
3
SE
2
G5
SW
4
G5
ESE
3
SE
2
SW
0
G3
SW
2
SW
2
G3
N
2
G3
ENE
2
ESE
2
G5
E
1
G9
SE
3
G7
SE
5
G6
SE
7
SE
8
SE
7
SSE
5
SSE
7
SE
10
SE
9
SSE
9
G11
S
5
G13
SW
4
G15
WSW
3
G17
WNW
3
G19
NNW
3
G20
N
4
G20
NE
PRECIP
chance %
0%
0%
0%
0%
0%
0%
0%
0%
1%
1%
1%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
1%
1%
1%
1%
0%
3%
3%
3%
3%
3%
3%
8%
8%
8%
8%
8%
8%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
27%
27%
27%
27%
27%
27%
35%
35%
35%
35%
35%
35%
8%
8%
8%
8%
8%
8%
6%
6%
6%
6%
6%
6%
67%
67%
67%
67%
67%
67%
61%
61%
61%
61%
61%
61%
28%
28%
28%
28%
28%
28%
37%
37%
37%
37%
37%
37%
54%
54%
54%
54%
54%
54%
37%
37%
37%
37%
37%
CLOUDS
cover %
0%
clear
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%
3%
10%
100%
71%
8%
100%
75%
15%
75%
3%
1%
0%
8%
29%
8%
6%
100%
75%
100%
100%
10%
21%
100%
100%
100%
93%
75%
70%
63%
65%
37%
18%
14%
0%
65%
72%
6%
16%
11%
10%
9%
22%
54%
98%
64%
77%
20%
37%
24%
100%
100%
100%
100%
92%
100%
56%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
60%
100%
100%
100%
100%
100%
97%
98%
82%
100%
99%
100%
100%
100%
100%
100%
100%
100%
100%
100%
PRESSURE
hPa · trend
1003
10031003100110021002100299910021001100199899999999999710021000100310001001
TemperatureWind / GustsPrecipitationCloud coverPressure
Nowscroll →
FISH INDEX
69
Temperature
Warm
Wind
Calm
Pressure
Rising — Slow
Moon Phase
Average
DAYLIGHT
SUNRISE
05:48 AM
SUNSET
08:42 PM
14H 54M OF DAYLIGHT14H 27M REMAINING
MOON PHASE
Waning Gibbous
94% illuminated

Station Location

39.5146, -77.7772
Loading map…
DATA · USGS · NOAA · NWSUPDATED 2026-07-02 06:15 UTC
Site #01617800·USGS

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