MEDIAN FLOW RATE · 1 DAY
6.56cfs 40.2% vs avg
Optimal band: 6–8 cfs
PERIOD HIGH
6.89cfs
PERIOD LOW
6.25cfs
RUNNABLE
100%
last 1 day in band
Gauge Height
1.05ft
Precipitation History
Precipitation · YTD
NormalNear-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)
Feb: 2.18" · normal 2.66" (1.3–4.9)
Mar: 3.55" · normal 3.77" (1.7–5.2)
Apr: 1.94" · normal 3.45" (2.0–5.3)
May: 5.08" · normal 3.69" (1.4–5.6)
Jun: 3.08" · normal 3.36" (1.7–5.5)
Jul: 0.00" (so far)· normal 3.36" (1.8–5.3)
Aug: normal 2.77" (1.5–4.2)
Sep: normal 4.12" (1.2–7.8)
Oct: normal 3.27" (0.8–5.5)
Nov: normal 2.92" (1.3–4.4)
Dec: normal 3.34" (1.7–4.9)
Baseline 1991–2020 · Source: Open-Meteo06:15 AM
Your History · MARSH RUN AT GRIMES, MD
Track your history
Sign in to track your sessions at MARSH RUN AT GRIMES, MD — best days, monthly trends, and time on the water.
Sign inSPONSORED
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°
FISH INDEX
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, -77.7772Loading map…
DATA · USGS · NOAA · NWSUPDATED 2026-07-02 06:15 UTC
Site #01617800·USGS
Create a free account to save favorites, set flow alerts, and track conditions