Rivermatics

USGS Streamgage 09201500

Boulder Creek above Boulder Lake, near Boulder, WY

Boulder Creek above Boulder Lake, near Boulder, WY is USGS streamgage 09201500 in Wyoming, monitoring river discharge in hydrologic subbasin 14040102. It sits on the Boulder Creek, alongside 1 other gauge Rivermatics tracks on the same river. It drains a watershed of about 115 square miles. Discharge records at this site go back to 1938. Typical flow runs near 123.6 cfs in July and 100 cfs in April, with the higher of the two arriving in July. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.

View live conditions & forecast →

Gauge details

State
Wyoming
Drainage area
115 sq mi
Gauge elevation
7,304 ft
Subbasin (HUC-8)
14040102
Coordinates
42.85634, -109.61737
USGS site number
09201500
Records begin
1938-10-01 (88 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Boulder Creek above Boulder Lake, near Boulder, WY. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.

Forecast daily mean discharge in cubic feet per second, by date
Date Low p10 Expected p50 High p90 Range
19.4 21.3 23.3
17.6 19.9 22.1
16.5 19 21.9
15.9 18.6 21.8
15.4 18.2 21.3
14.8 17.7 21.2
15.4 19.1 24.8
15.1 19.2 26.1
14.4 18.4 24.4
13.6 17.4 22.6
13 16.6 21.5
12.6 16.2 20.9
12.1 15.7 20.5
11.7 15.4 20.2

All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 88 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 — 19.6 —
February — 23 —
March — 25.8 —
April — 100 —
May — 514.5 —
June — 717.4 —
July — 123.6 —
August — 23.7 —
September — 10.5 —
October — 22.3 —
November — 32.5 —
December — 26.2 —

All values in cubic feet per second (cfs).

Common questions

When does Boulder Creek above Boulder Lake, near Boulder, WY normally run highest?
June, on the long-term record. The median daily flow that month is about 717.4 cfs, against 10.5 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
How long has Boulder Creek above Boulder Lake, near Boulder, WY been measured?
Discharge records at USGS site 09201500 begin in 1938, about 88 years, covering roughly 1,028 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Boulder Creek above Boulder Lake, near Boulder, WY?
Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow 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 the live gauge screen. Open live conditions to see the current outlook.
Where is Boulder Creek above Boulder Lake, near Boulder, WY?
The gauge sits at 42.85634, -109.61737, in Wyoming, in hydrologic subbasin 14040102, at an elevation of about 7,304 feet, draining roughly 115 square miles.
Can I use Boulder Creek above Boulder Lake, near Boulder, WY 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.

Upstream and downstream on the Boulder Creek

Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Boulder Creek in full.

Other gauges in this subbasin