Rock Creek
The best month to fish the Rock Creek is September. The month to avoid is May. Right now, in August, it is worth going.
- January: 57 out of 100
- February: 65 out of 100
- March: 71 out of 100
- April: 77 out of 100
- May: 45 out of 100
- June: 55 out of 100
- July: 71 out of 100
- August: 94 out of 100
- September: 96 out of 100
- October: 71 out of 100
- November: 70 out of 100
- December: 59 out of 100
GAUGE 12334510 · COLOURED BY AUGUST
Month by month
| MONTH | TYPICAL FLOW | RANGE (P20–P80) | WATER | AIR HIGH | RAIN | SCORE |
|---|---|---|---|---|---|---|
| January | 175 cfs | 157–215 | 33.3°F | — | — | 57 |
| February | 184 cfs | 169–211 | 33.8°F | — | — | 65 |
| March | 251 cfs | 219–315 | 38.0°F | — | — | 71 |
| April | 607 cfs | 444–822 | 43.2°F | — | — | 77 |
| May | 1,789 cfs | 1,317–2,437 | 47.2°F | — | — | 45 |
| June | 1,537 cfs | 1,000–2,215 | 53.1°F | — | — | 55 |
| July | 588 cfs | 380–812 | 61.1°F | — | — | 71 |
| AugustNOW | 296 cfs | 207–389 | 59.9°F | — | — | 94 |
| September | 253 cfs | 192–305 | 53.8°F | — | — | 96 |
| October | 247 cfs | 213–283 | — | — | — | 71 |
| November | 240 cfs | 198–280 | 36.7°F | — | — | 70 |
| December | 194 cfs | 168–219 | 33.4°F | — | — | 59 |
WHERE THESE NUMBERS COME FROM
Flow and water temperature are medians of the monthly means reported by USGS gauge 12334510 over 2006-2025. Air temperature and precipitation are ten-year normals from Open-Meteo at this river’s gauge coordinates.
The window is deliberate. USGS’s own full-record statistics for a dammed river reach back before the dam — at Lees Ferry, to 1922, forty-one years before Glen Canyon closed — and describe a river that no longer exists.
Flow is scored against this river’s own fishable band of 240–588 cfs. There is no universal band: 8,000 cfs is low water on a big tailwater and a flood on a spring creek.
Water temperature is a ceiling rather than a weight. Above about 68°F a trout that is fought and released frequently dies anyway, so no month above that line is scored as worth booking, however good its flow.
The Rock Creek is at its best in September — water around 54°F, flows near 253 cfs.
← RIVERS GOING WELL IN AUGUSTRegulations, licences and access change without notice and are not reproduced here as fact — check the state agency before you travel. A median describes twenty years; it does not forecast your week. Source: U.S. Geological Survey, National Water Information System.