California · river
Tuolumne River A Grand Cyn of Tuolumne above Hetch Hetchy
Live conditions for this USGS-monitored stretch of water, updated every 15 minutes.
Good
Paddle Score, from live wind and water conditions
Wind
12 mph
gusting to 13 mph
Air temp
93°F
1% chance of rain
River flow
33.6 cfs
normal for this date
Best day to paddle this week
Friday · 84
Today
77
93°
Fri
84
92°
Best
Sat
79
89°
Sun
75
90°
Mon
74
89°
Tue
75
90°
Wed
73
90°
Scored from each day's peak forecast wind, heat, and rain chance — river flow isn't forecastable, so check back before you load the boat.
Wind, next 12 hours
mph| Hour | Wind (mph) | Gusts (mph) |
|---|---|---|
| 3p | 12 | 13 |
| 4p | 12 | 14 |
| 5p | 12 | 15 |
| 6p | 11 | 14 |
| 7p | 8 | 11 |
| 8p | 6 | 8 |
| 9p | 4 | 5 |
| 10p | 3 | 5 |
| 11p | 6 | 7 |
| 12a | 4 | 7 |
| 1a | 3 | 5 |
| 2a | 4 | 8 |
Is this flow normal for August 20?
Today's 33.6 cfs is 14% below the median for this date — which counts as normal water here.
The median flow on this date is 39 cfs, across 18 years of USGS record at this gauge. Whether that is runnable depends on the stretch — this is context, not a recommendation.
Why this score
- Wind — 12 mph — noticeable but manageable-15
- Heat — 93°F — bring more water than you think-5
We don't have launch notes for this one
This page is built from the USGS gauge at this location, so the flow and weather are real — but we haven't verified where to put in, what the hazards are, or whether this stretch is legal or sensible to paddle. We'd rather say that than invent it. The links below are where to find out.
We also don't have a verified safe-flow range here, so the Paddle Score reflects weather only. Judge the flow number against local knowledge, not against our score.
Do your own homework
We show you live conditions. For local knowledge — where to put in, what the hazards are, whether it's worth the drive — here's where paddlers actually talk about this water. We don't vet these sources; check the dates and judge for yourself.
- Paddler discussion on Reddit
Trip reports and local warnings, straight from the source
- Search American Whitewater
Rapid classifications and gauge-linked run descriptions
- Satellite view and access roads
Check parking, put-ins, and what the banks actually look like
- Video from this water
The fastest way to see the character of a run before you drive
- USGS gauge 11274790
Full hydrograph, historical flows, and station metadata