Tuolumne R A Grand Cyn of Tuolumne Ab Hetch Hetchy River

USGS · 11274790

TUOLUMNE R A GRAND CYN OF TUOLUMNE AB HETCH HETCHY RIVER

USGS · 11274790LIVE

TUOLUMNE R A GRAND CYN OF TUOLUMNE AB HETCH HETCHY

TUOLUMNE COUNTY, CA37.9166°N, -119.6599°W Updated 24 min ago

FLOW RATE

176cfs

GAUGE HT

8.57ft

WATER TEMP

17°F

AIR TEMP

78°F

WIND

2mph WNW

FISH INDEX

75SCORE / 100

GREAT · 4 OF 5

1D 7D 30D 1YR

Flow Rate Historical Avg

MEDIAN FLOW RATE · 1 DAY

176cfs 80.9% vs avg

Optimal band: 162–218 cfs

PERIOD HIGH

213cfs

PERIOD LOW

172cfs

RUNNABLE

100%

last 1 day in band

Gauge Height

8.57ft

Water Temperature

16.7°F

Precipitation History

Your History · TUOLUMNE R A GRAND CYN OF TUOLUMNE AB HETCH HETCHY

Track your history

Sign in to track your sessions at TUOLUMNE R A GRAND CYN OF TUOLUMNE AB HETCH HETCHY — best days, monthly trends, and time on the water.

SPONSORED

Weather Conditions

WEATHER CONDITIONS

TODAY

90°

66°

THU

90°

70°

FRI

93°

67°

SAT

95°

69°

SUN

93°

72°

MON

96°

72°

TUE

97°

75°

TIME

WED

NOW

THU

FRI

SAT

SUN

MON

TEMP

hourly forecast

89°

mild

89°

87°

85°

82°

78°

73°

71°

73°

72°

71°

70°

71°

78°

82°

85°

86°

88°

89°

90°

89°

88°

86°

84°

80°

75°

74°

72°

73°

75°

74°

72°

70°

68°

67°

71°

82°

86°

88°

90°

92°

93°

92°

90°

88°

85°

73°

70°

69°

70°

74°

85°

88°

90°

92°

94°

95°

94°

93°

91°

89°

85°

75°

74°

73°

74°

73°

72°

73°

74°

72°

76°

83°

87°

89°

91°

93°

91°

88°

86°

81°

77°

78°

77°

76°

75°

74°

72°

76°

80°

WIND

mph · gust · dir

12mph WNW

G 14 mph

G14

WNW

G14

WNW

G13

G12

WNW

SSW

WSW

WNW

G11

G14

G15

G14

WNW

G13

WNW

G14

WNW

G14

WNW

G13

WNW

G11

WNW

G10

WNW

NNW

ENE

ESE

NNE

SSW

ENE

WSW

G11

WSW

G13

WSW

G13

WSW

G13

WSW

G11

WSW

G10

WSW

ESE

ENE

SSE

WSW

NNW

ENE

WSW

G13

WSW

G16

WSW

G13

WSW

WNW

ENE

PRECIP

chance %

CLOUDS

cover %

clear

12%

53%

55%

87%

100%

70%

100%

98%

95%

PRESSURE

hPa · trend

889

TemperatureWind / GustsPrecipitationCloud coverPressure

Nowscroll →

FISH INDEX

Temperature

Warm

Wind

Calm

Pressure

Rising — Slow

Moon Phase

Good

DAYLIGHT

SUNRISE

05:43 AM

SUNSET

08:23 PM

14H 40M OF DAYLIGHT

MOON PHASE

Last Quarter

37% illuminated

Station Location

37.9166, -119.6599

Loading map…

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

Site #11274790·USGS

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