Rivermatics

3 USGS Streamgages · Colorado River system

Granite Creek flows and levels

Granite Creek is gauged at 3 USGS streamgages in Arizona, each tracked by Rivermatics. The mainstem runs about 36 miles (58 km) from headwaters to outlet. It drains into the Colorado River system. Drainage area at the gauges ranges from 30 square miles at Granite Creek at Prescott, AZ up to 47 at Granite Creek below Watson Lake near Prescott, AZ. The gauged reach falls about 265 feet, from 5,285 feet down to 5,020. 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.

USGS streamgages on this river, ordered upstream to downstream
Gauge State Drainage sq mi Elevation ft April p50 cfs July p50 cfs Forecast
Granite Creek at Prescott, AZ AZ 30 5,285 1.6 0.1 14-day
Granite Creek near Prescott, AZ AZ 36 5,204 2 0.1 14-day
Granite Creek below Watson Lake near Prescott, AZ AZ 47 5,020 0 0 14-day

Typical flow by month at Granite Creek below Watson Lake near Prescott, 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 27 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January 0 0.2 15.5
February 0 0.5 35.5
March 0 0.5 52.4
April 0 0 1.7
May 0 0 1
June 0 0 0.5
July 0 0 2.4
August 0 0 3.5
September 0 0 2.2
October 0 0 0.6
November 0 0 1
December 0 0.1 2.4

All values in cubic feet per second (cfs).

Common questions

When does the Granite Creek run highest?
February, on the long-term record at Granite Creek below Watson Lake near Prescott, AZ — the furthest-downstream gauge Rivermatics tracks on this river. Median daily flow there is about 0.5 cfs that month, against 0 cfs in April, 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 Granite Creek?
Rivermatics tracks 3 USGS streamgages on the Granite Creek, 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 Granite Creek?
Yes, at 3 of the 3 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 Granite Creek part of?
The Granite Creek 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 Granite Creek 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

Browse nearby gauges by state