2 USGS Streamgages · Colorado River system
Hams Fork flows and levels
Hams Fork is gauged at 2 USGS streamgages in Wyoming, each tracked by Rivermatics. The mainstem runs about 154 miles (248 km) from headwaters to outlet. It drains into the Colorado River system. Drainage area at the gauges ranges from 129 square miles at Hams Fork below Pole Creek, near Frontier, WY up to 390 at Hams Fork at Diamondville, WY. The gauged reach falls about 590 feet, from 7,465 feet down to 6,875. Rivermatics issues a daily machine-learned 14-day flow outlook for every one of them.
Gauges on this river, upstream to downstream
Ordered by drainage area, which is how far down the river each gauge sits. April and July figures are long-term median daily flows for that month from the USGS record — historical normals, not a forecast and not today's reading.
| Gauge | State | Drainage sq mi | Elevation ft | April p50 cfs | July p50 cfs | Forecast |
|---|---|---|---|---|---|---|
| Hams Fork below Pole Creek, near Frontier, WY | WY | 129 | 7,465 | 82.5 | 68.2 | 14-day |
| Hams Fork at Diamondville, WY | WY | 390 | 6,875 | 233 | 76.5 | 14-day |
Typical flow by month at Hams Fork at Diamondville, WY
The furthest-downstream gauge on this river, so the fullest flow it carries here. Long-term daily discharge percentiles from the USGS record (up to 32 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | 10 | 21 | 30.2 | |
| February | 12 | 23.3 | 28.1 | |
| March | 13.1 | 34.3 | 111 | |
| April | 78.2 | 233 | 721.8 | |
| May | 277.1 | 774.3 | 1,553.5 | |
| June | 66.6 | 427.1 | 809.5 | |
| July | 11.1 | 76.5 | 173.9 | |
| August | 9.4 | 29.9 | 61.7 | |
| September | 6.9 | 24.1 | 45.6 | |
| October | 14.7 | 34.2 | 52.9 | |
| November | 17.7 | 29.6 | 47.7 | |
| December | 11 | 25 | 36.5 |
All values in cubic feet per second (cfs).
Common questions
- When does the Hams Fork run highest?
- May, on the long-term record at Hams Fork at Diamondville, WY — the furthest-downstream gauge Rivermatics tracks on this river. Median daily flow there is about 774.3 cfs that month, against 21 cfs in January, the lowest. Upstream gauges peak on their own schedule; the table on this page gives April and July for each.
- How many gauges are on the Hams Fork?
- Rivermatics tracks 2 USGS streamgages on the Hams Fork, across Wyoming. Each has its own page with the site's full flow record and monthly normals. The river may carry other gauges that publish neither daily values nor discharge statistics; those are not tracked here.
- Is there a flow forecast for the Hams Fork?
- Yes, at 2 of the 2 gauges. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on each basin's observed flows, weather and snowpack, and issues a daily outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on each gauge's live screen.
- What river system is the Hams Fork part of?
- The Hams Fork drains into the Colorado River system — it is a tributary somewhere in that chain, following the flowpath down to its terminal river. Rivermatics builds this from the USGS/geoconnex reference-mainstem network rather than from names.
- Can I use Hams Fork data for flood or safety decisions?
- No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.
Other rivers in the Colorado River system
- Gila River 17 gauges
- San Juan River 10 gauges
- Animas River 9 gauges
- Gore Creek 9 gauges
- Green River 9 gauges
- Little Colorado River 9 gauges
- Virgin River 8 gauges
- Yampa River 8 gauges