USGS · 01645762

S F LITTLE DIFFICULT RUN

USGS · 01645762LIVE

S F LITTLE DIFFICULT RUN ABOVE MOUTH NR VIENNA, VA

RESTON, VA38.9089°N, -77.3383°W Updated 2 hr ago

FLOW RATE

0cfs

AIR TEMP

77°F

WIND

5mph ENE

FISH INDEX

75SCORE / 100

GREAT · 4 OF 5

1D 7D 30D 1YR

Flow Rate Historical Avg

MEDIAN FLOW RATE · 1 YEAR

0cfs 60.9% vs avg

Optimal band: 1–1 cfs

PERIOD HIGH

26cfs

PERIOD LOW

1cfs

RUNNABLE

69%

last 1 year in band

Precipitation History

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Weather Conditions

WEATHER CONDITIONS

TODAY

87°

72°

TUE

82°

72°

WED

78°

69°

THU

92°

70°

FRI

88°

70°

SAT

87°

70°

SUN

82°

64°

TIME

TUE

NOW

WED

THU

FRI

SAT

TEMP

hourly forecast

74°

mild

74°

73°

72°

73°

74°

76°

78°

79°

77°

82°

80°

77°

76°

77°

76°

75°

73°

72°

71°

70°

69°

70°

72°

71°

72°

73°

74°

77°

78°

77°

75°

74°

73°

72°

71°

70°

72°

74°

76°

78°

82°

87°

89°

92°

91°

74°

75°

74°

73°

72°

71°

70°

71°

75°

79°

82°

84°

85°

88°

82°

81°

82°

76°

75°

76°

74°

73°

72°

71°

70°

71°

74°

77°

79°

83°

85°

87°

86°

87°

86°

83°

79°

76°

74°

WIND

mph · gust · dir

7mph ENE

G 12 mph

G12

ENE

G13

ENE

G12

ENE

G10

ENE

G10

ENE

ESE

NNE

G13

ESE

G13

ESE

G10

ESE

ENE

G12

SSE

G12

G15

ENE

G19

ENE

G19

ENE

G15

ENE

G13

ENE

G13

ENE

G13

ENE

G11

ENE

ESE

SSE

SSW

SSE

G11

SSE

G15

SSE

G17

G18

G19

G20

G18

G16

G13

G12

SSW

G10

SSW

G10

SSW

G11

G12

G10

WSW

G18

G12

SSE

G12

G13

G12

WSW

G11

G13

G14

WNW

G13

G16

WNW

G19

WNW

G18

G24

WNW

G19

WNW

G18

WNW

G11

WNW

G16

G15

G12

G10

NNW

G10

NNW

WSW

PRECIP

chance %

27%

21%

14%

18%

20%

21%

25%

28%

30%

29%

22%

17%

11%

18%

19%

16%

18%

13%

11%

15%

17%

18%

42%

21%

64%

55%

85%

30%

38%

21%

14%

20%

38%

21%

CLOUDS

cover %

100%

overcast

100%

51%

100%

96%

82%

100%

92%

100%

66%

74%

100%

92%

100%

69%

64%

86%

92%

100%

96%

21%

24%

94%

78%

100%

23%

14%

100%

14%

99%

100%

27%

100%

64%

100%

64%

78%

100%

90%

PRESSURE

hPa · trend

1001

TemperatureWind / GustsPrecipitationCloud coverPressure

Nowscroll →

FISH INDEX

Temperature

Warm

Wind

Light

Pressure

Stable

Moon Phase

Good

DAYLIGHT

SUNRISE

05:50 AM

SUNSET

08:37 PM

14H 47M OF DAYLIGHT

MOON PHASE

Last Quarter

53% illuminated

Station Location

38.9089, -77.3383

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DATA · USGS · NOAA · NWSUPDATED 2026-07-07 00:00 UTC

Site #01645762·USGS

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