USGS · 01661500

ST MARYS RIVER

USGS · 01661500LIVE

ST MARYS RIVER AT GREAT MILLS, MD

MARYLAND38.2418°N, -76.5037°W Updated 29 min ago

FLOW RATE

8.22cfs

GAUGE HT

1.50ft

AIR TEMP

80°F

WIND

5mph NNE

FISH INDEX

63SCORE / 100

GOOD · 3 OF 5

1D 7D 30D 1YR

Flow Rate Historical Avg

MEDIAN FLOW RATE · 1 DAY

8.22cfs 59.9% vs avg

Optimal band: 15–20 cfs

PERIOD HIGH

38.4cfs

PERIOD LOW

8.22cfs

RUNNABLE

15%

last 1 day in band

Gauge Height

1.50ft

Precipitation History

Your History · ST MARYS RIVER AT GREAT MILLS, MD

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Weather Conditions

WEATHER CONDITIONS

TODAY

86°

73°

WED

84°

72°

THU

89°

73°

FRI

96°

71°

SAT

87°

71°

SUN

86°

71°

MON

83°

70°

TIME

WED

NOW

THU

FRI

SAT

SUN

TEMP

hourly forecast

73°

mild

73°

72°

73°

72°

73°

75°

81°

82°

84°

83°

82°

80°

78°

76°

75°

74°

73°

75°

77°

79°

81°

82°

83°

89°

88°

83°

87°

78°

81°

80°

78°

77°

75°

74°

73°

72°

71°

72°

75°

80°

86°

90°

91°

92°

94°

96°

93°

92°

84°

77°

72°

73°

72°

71°

72°

71°

74°

79°

82°

84°

87°

86°

84°

82°

81°

77°

74°

73°

72°

71°

72°

75°

76°

77°

83°

85°

86°

85°

82°

79°

78°

77°

WIND

mph · gust · dir

10mph ENE

G 19 mph

G19

ENE

G16

ENE

G14

ENE

G15

G13

ENE

G11

ENE

G11

ENE

NNW

SSE

G11

SSE

G12

SSE

G14

SSE

G14

SSE

G14

G16

SSW

G15

SSW

G12

G10

G11

G10

G11

SSE

G12

G13

SSW

G12

G13

SSE

WNW

NNW

WNW

G10

WNW

G12

WNW

G13

WNW

G11

WNW

G11

G10

WNW

WSW

G10

WSW

G14

WSW

G17

G18

G15

NNW

ESE

G18

G11

WNW

G10

NNW

G13

NNW

G15

G16

G19

NNW

G20

NNW

G17

G14

G13

G12

NNE

G11

NNE

G11

NNE

G12

G13

NNE

G13

NNE

G13

NNE

G15

NNE

G11

NNE

ENE

ESE

G10

SSE

NNW

NNE

ENE

ESE

G11

G13

G15

ESE

G15

ESE

PRECIP

chance %

40%

41%

29%

25%

11%

13%

63%

83%

42%

37%

38%

21%

36%

19%

16%

10%

CLOUDS

cover %

100%

overcast

100%

97%

99%

100%

49%

68%

36%

15%

100%

77%

92%

61%

37%

100%

86%

100%

77%

40%

75%

15%

24%

100%

15%

100%

59%

19%

17%

13%

12%

100%

69%

100%

49%

100%

68%

100%

98%

33%

39%

18%

14%

100%

80%

100%

92%

100%

42%

100%

PRESSURE

hPa · trend

1013

TemperatureWind / GustsPrecipitationCloud coverPressure

Nowscroll →

FISH INDEX

Temperature

Too Hot

Wind

Light

Pressure

Stable

Moon Phase

Good

DAYLIGHT

SUNRISE

05:49 AM

SUNSET

08:32 PM

14H 43M OF DAYLIGHT

MOON PHASE

Last Quarter

43% illuminated

Station Location

38.2418, -76.5037

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DATA · USGS · NOAA · NWSUPDATED 2026-07-08 01:15 UTC

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