USGS · 06111800

BIG SPRING CR

USGS · 06111800LIVE

Big Spring Cr at R&B Trading Post nr Lewistown MT

FERGUS COUNTY, MT47.0878°N, -109.4575°W Updated 13 hr ago

FLOW RATE

168cfs

AIR TEMP

52°F

WIND

2mph SSE

FISH INDEX

75SCORE / 100

GREAT · 4 OF 5

1D 7D 30D 1YR

Flow Rate Historical Avg

MEDIAN FLOW RATE · 7 DAY

168cfs 11.0% vs avg

Optimal band: 139–189 cfs

PERIOD HIGH

171cfs

PERIOD LOW

155cfs

RUNNABLE

100%

last 7 day in band

Precipitation History

SPONSORED

Weather Conditions

WEATHER CONDITIONS

TODAY

72°

47°

THU

73°

54°

FRI

80°

55°

SAT

71°

51°

SUN

64°

47°

MON

65°

46°

TUE

76°

51°

TIME

WED

NOW

THU

FRI

SAT

SUN

MON

TEMP

hourly forecast

69°

mild

69°

71°

72°

71°

67°

63°

61°

59°

58°

57°

56°

55°

56°

60°

63°

66°

68°

67°

68°

70°

71°

73°

58°

56°

54°

55°

57°

56°

55°

56°

58°

60°

61°

67°

72°

76°

75°

77°

80°

78°

62°

69°

65°

62°

57°

55°

53°

52°

53°

52°

51°

52°

56°

59°

61°

64°

69°

70°

71°

62°

54°

57°

55°

57°

56°

53°

52°

51°

50°

51°

50°

49°

52°

54°

57°

60°

63°

64°

63°

61°

54°

58°

59°

58°

52°

49°

47°

46°

47°

48°

49°

WIND

mph · gust · dir

6mph E

G 7 mph

ESE

G12

ESE

G16

G21

ESE

G26

ESE

G25

ESE

G25

ESE

G25

ESE

G25

ESE

G25

ESE

G26

ESE

G26

ESE

G24

ESE

G26

ESE

G26

G28

ESE

G29

ESE

G27

ESE

G21

G10

SSW

G15

SSE

G12

ESE

G11

ESE

G15

ESE

G39

WNW

NNW

ENE

G11

ESE

G13

ESE

G11

G10

G16

SSW

G16

ESE

G10

SSW

G12

G13

WNW

G15

WNW

ESE

SSE

WNW

NNW

NNE

G13

ENE

G21

ESE

WNW

SSE

WSW

SSW

WNW

G12

WNW

G14

NNW

G16

G17

SSW

G22

SSW

G15

SSW

G16

G18

WSW

G20

WSW

G21

WSW

G23

G24

PRECIP

chance %

11%

16%

19%

15%

21%

18%

13%

72%

91%

45%

20%

71%

55%

47%

60%

38%

36%

CLOUDS

cover %

clear

88%

44%

19%

28%

82%

99%

100%

73%

100%

33%

100%

97%

98%

94%

100%

77%

45%

100%

99%

90%

98%

99%

100%

95%

100%

81%

100%

65%

84%

98%

93%

22%

83%

100%

65%

26%

18%

100%

92%

100%

83%

79%

97%

100%

10%

73%

83%

64%

100%

89%

12%

83%

96%

29%

97%

32%

11%

100%

98%

100%

17%

19%

46%

69%

83%

93%

100%

PRESSURE

hPa · trend

889

TemperatureWind / GustsPrecipitationCloud coverPressure

Nowscroll →

FISH INDEX

Temperature

Ideal

Wind

Calm

Pressure

Rising — Slow

Moon Phase

Average

DAYLIGHT

SUNRISE

05:23 AM

SUNSET

09:17 PM

15H 54M OF DAYLIGHT7H 27M REMAINING

MOON PHASE

Waxing Gibbous

70% illuminated

Station Location

47.0878, -109.4575

Loading map…

DATA · USGS · NOAA · NWSUPDATED 2026-06-24 13:50 UTC

Site #06111800·USGS

Create a free account to save favorites, set flow alerts, and track conditions