2 USGS Streamgages · Colorado River system
Big Sandy River flows and levels
Big Sandy River is gauged at 2 USGS streamgages in Arizona, each tracked by Rivermatics. It feeds the Bill Williams River. It drains into the Colorado River system. The gauged reach falls about 421 feet, from 1,818 feet down to 1,397. 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 |
|---|---|---|---|---|---|---|
| Big Sandy River near Wikieup, AZ | AZ | 2,742 | 1,397 | 7 | 3.4 | 14-day |
| Big Sandy River at US 93 Bridge, near Wikieup, AZ | AZ | — | 1,818 | 1.9 | 0.3 | 14-day |
Typical flow by month at Big Sandy River at US 93 Bridge, near Wikieup, AZ
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 8 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 | — | 2 | — | |
| February | — | 3 | — | |
| March | — | 4 | — | |
| April | — | 1.9 | — | |
| May | — | 1 | — | |
| June | — | 0.4 | — | |
| July | — | 0.3 | — | |
| August | — | 0.2 | — | |
| September | — | 0.2 | — | |
| October | — | 0.4 | — | |
| November | — | 0.7 | — | |
| December | — | 1 | — |
All values in cubic feet per second (cfs).
Common questions
- When does the Big Sandy River run highest?
- March, on the long-term record at Big Sandy River at US 93 Bridge, near Wikieup, AZ — the furthest-downstream gauge Rivermatics tracks on this river. Median daily flow there is about 4 cfs that month, against 0.2 cfs in August, 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 Big Sandy River?
- Rivermatics tracks 2 USGS streamgages on the Big Sandy River, across Arizona. 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 Big Sandy River?
- 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 Big Sandy River part of?
- The Big Sandy River 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 Big Sandy River 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