USGS · 06479525

BIG SIOUX RIVER

USGS · 06479525LIVE

Big Sioux R nr Castlewood, SD

SOUTH DAKOTA44.7316°N, -97.0446°W Updated 16 hr ago

FLOW RATE

441cfs

GAUGE HT

7.76ft

AIR TEMP

84°F

WIND

13mph SW

FISH INDEX

50SCORE / 100

GOOD · 3 OF 5

1D 7D 30D 1YR

Flow Rate Historical Avg

MEDIAN FLOW RATE · 1 YEAR

441cfs 48.6% vs avg

Optimal band: 155–209 cfs

PERIOD HIGH

1,418cfs

PERIOD LOW

32cfs

RUNNABLE

14%

last 1 year in band

Gauge Height

7.76ft

Precipitation History

Your History · Big Sioux R nr Castlewood, SD

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Weather Conditions

WEATHER CONDITIONS

TODAY

92°

67°

MON

92°

66°

TUE

100°

64°

WED

101°

66°

THU

99°

67°

FRI

102°

71°

SAT

110°

76°

TIME

SUN

NOW

MON

TUE

WED

THU

FRI

TEMP

hourly forecast

92°

mild

92°

90°

86°

81°

77°

75°

73°

72°

70°

69°

68°

67°

66°

67°

74°

80°

83°

86°

88°

90°

91°

92°

91°

89°

85°

80°

76°

74°

72°

70°

69°

67°

66°

65°

64°

66°

73°

79°

85°

89°

92°

95°

97°

99°

100°

98°

96°

91°

85°

80°

79°

76°

72°

70°

69°

68°

67°

66°

68°

74°

81°

86°

90°

94°

95°

97°

99°

100°

101°

100°

97°

93°

86°

78°

75°

73°

72°

70°

69°

68°

67°

68°

74°

79°

84°

88°

92°

95°

97°

98°

99°

98°

97°

93°

87°

83°

82°

81°

79°

78°

76°

75°

73°

71°

72°

76°

83°

89°

WIND

mph · gust · dir

12mph SSW

G 15 mph

G15

SSW

G16

SSW

G16

SSW

G17

G18

G15

G13

SSE

G17

G16

SSE

G16

SSE

G16

SSE

G15

SSE

G13

SSE

G14

SSE

G24

SSW

G24

SSW

G25

G22

SSW

G21

SSW

G21

SSW

G21

SSW

G20

SSW

G18

SSW

G18

G20

G22

G14

G15

SSE

G18

G17

SSE

G16

SSE

G15

SSE

G17

SSE

G19

G23

G24

SSW

G19

G16

G14

G12

G11

G10

SSW

G10

SSW

G13

G16

G18

SSE

G27

SSE

G30

SSE

G29

G28

G18

G14

G15

G18

SSW

G16

G14

WSW

ESE

G10

SSE

SSW

G21

G13

SSE

G19

ESE

G20

ESE

G13

ESE

G10

ESE

G11

SSE

G12

SSE

G12

SSE

G13

SSE

G14

SSE

G19

G26

G32

G35

G36

SSE

G35

G34

G32

G30

G29

G28

G27

SSE

G23

G19

G16

PRECIP

chance %

CLOUDS

cover %

clear

31%

11%

93%

76%

100%

76%

14%

15%

13%

96%

82%

100%

12%

11%

12%

76%

85%

11%

16%

17%

25%

35%

39%

29%

13%

12%

28%

40%

PRESSURE

hPa · trend

961

TemperatureWind / GustsPrecipitationCloud coverPressure

Nowscroll →

FISH INDEX

Temperature

Too Hot

Wind

Moderate

Pressure

Stable

Moon Phase

Average

DAYLIGHT

SUNRISE

05:54 AM

SUNSET

09:13 PM

15H 19M OF DAYLIGHT

MOON PHASE

Waning Crescent

5% illuminated

Station Location

44.7316, -97.0446

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DATA · USGS · NOAA · NWSUPDATED 2026-07-12 00:00 UTC

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