USGS · 01645704

DIFFICULT RUN

USGS · 01645704LIVE

DIFFICULT RUN ABOVE FOX LAKE NEAR FAIRFAX, VA

RESTON, VA38.8847°N, -77.3324°W Updated 1 hr ago

FLOW RATE

2.08cfs

GAUGE HT

0.93ft

WATER TEMP

22°F

AIR TEMP

71°F

WIND

3mph ENE

FISH INDEX

88SCORE / 100

EPIC · 5 OF 5

1D 7D 30D 1YR

Flow Rate Historical Avg

MEDIAN FLOW RATE · 1 DAY

2.08cfs 79.7% vs avg

Optimal band: 2–2 cfs

PERIOD HIGH

2.4cfs

PERIOD LOW

1.52cfs

RUNNABLE

last 1 day in band

Gauge Height

0.93ft

Water Temperature

22.0°F

Water Turbidity

Precipitation History

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Weather Conditions

WEATHER CONDITIONS

TODAY

78°

71°

MON

83°

68°

TUE

94°

69°

WED

100°

73°

THU

103°

80°

FRI

104°

81°

SAT

103°

81°

TIME

SUN

NOW

MON

TUE

WED

THU

FRI

TEMP

hourly forecast

72°

mild

72°

73°

74°

75°

77°

78°

77°

76°

74°

71°

70°

69°

68°

69°

72°

73°

75°

77°

79°

80°

82°

83°

82°

81°

78°

75°

73°

72°

71°

70°

69°

71°

75°

79°

82°

86°

89°

91°

93°

94°

90°

84°

81°

80°

78°

77°

76°

75°

74°

73°

75°

79°

84°

89°

93°

95°

98°

99°

100°

99°

97°

93°

90°

88°

85°

82°

81°

80°

81°

85°

89°

92°

96°

99°

101°

102°

103°

102°

100°

95°

92°

89°

87°

85°

84°

82°

81°

WIND

mph · gust · dir

5mph ENE

G 10 mph

G10

ENE

G11

ENE

NNE

ENE

NNW

NNE

ENE

ESE

G15

G12

G15

SSE

G15

SSE

G15

SSE

G14

G16

SSW

G15

SSW

G12

SSW

G13

SSW

G11

SSW

G10

SSW

G11

SSW

SSE

G15

G17

SSE

G18

SSE

G20

G27

SSW

G28

SSW

G27

SSW

G26

SSW

G19

SSW

G11

SSW

WNW

NNW

NNE

ENE

ESE

WSW

WNW

NNW

G11

NNE

NNW

ENE

WNW

G12

G15

G18

G20

NNW

PRECIP

chance %

38%

43%

36%

33%

22%

13%

14%

18%

20%

13%

11%

CLOUDS

cover %

100%

overcast

100%

59%

51%

100%

27%

100%

92%

15%

96%

73%

100%

56%

100%

96%

46%

33%

88%

18%

37%

15%

70%

11%

15%

12%

13%

100%

79%

98%

100%

93%

95%

14%

63%

47%

75%

23%

100%

69%

100%

71%

100%

62%

42%

50%

51%

61%

71%

82%

94%

100%

93%

81%

74%

PRESSURE

hPa · trend

1002

TemperatureWind / GustsPrecipitationCloud coverPressure

Nowscroll →

FISH INDEX

Temperature

Warm

Wind

Calm

Pressure

Stable

Moon Phase

Peak Activity

DAYLIGHT

SUNRISE

05:46 AM

SUNSET

08:38 PM

14H 52M OF DAYLIGHT10H 7M REMAINING

MOON PHASE

Full Moon

97% illuminated

PEAK ACTIVITY

Station Location

38.8847, -77.3324

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DATA · USGS · NOAA · NWSUPDATED 2026-06-28 10:31 UTC

Site #01645704·USGS

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