Rivermatics

2 USGS Streamgages · Colorado River system

Boulder Creek flows and levels

Boulder Creek is gauged at 2 USGS streamgages in Wyoming, each tracked by Rivermatics. The mainstem runs about 35 miles (56 km) from headwaters to outlet. It drains into the Colorado River system. Drainage area at the gauges ranges from 115 square miles at Boulder Creek above Boulder Lake, near Boulder, WY up to 126 at Boulder Creek below Boulder Lake, near Boulder, WY. The gauged reach falls about 127 feet, from 7,304 feet down to 7,177. Rivermatics issues a daily machine-learned 14-day flow outlook at 1 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
Boulder Creek above Boulder Lake, near Boulder, WY WY 115 7,304 100 123.6 14-day
Boulder Creek below Boulder Lake, near Boulder, WY WY 126 7,177 27.2 385.6 —

Typical flow by month at Boulder Creek below Boulder Lake, near Boulder, 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 35 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 0.8 10.2 39.8
February 1.7 12.1 46.5
March 3.5 12.5 49.2
April 6.4 27.2 78.5
May 100.2 306.8 863.3
June 442.2 937.3 1,905
July 197.6 385.6 871.1
August 55.6 137.6 250.2
September 18 74.8 172.9
October 7.5 33.2 117
November 0.8 11.5 62.9
December 1 8.9 49.8

All values in cubic feet per second (cfs).

Common questions

When does the Boulder Creek run highest?
June, on the long-term record at Boulder Creek below Boulder Lake, near Boulder, WY — the furthest-downstream gauge Rivermatics tracks on this river. Median daily flow there is about 937.3 cfs that month, against 8.9 cfs in December, 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 Boulder Creek?
Rivermatics tracks 2 USGS streamgages on the Boulder Creek, 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 Boulder Creek?
Yes, at 1 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 Boulder Creek part of?
The Boulder 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 Boulder 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

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