Rivermatics

USGS Streamgage 06395000

Cheyenne River at Edgemont, SD

Cheyenne River at Edgemont, SD is USGS streamgage 06395000 in South Dakota, monitoring river discharge in hydrologic subbasin 10120106. It sits on the Cheyenne River, alongside 8 other gauges Rivermatics tracks on the same river. It drains a watershed of about 7,171 square miles. Discharge records at this site go back to 1903. Typical flow runs near 20.5 cfs in July and 29.8 cfs in April, with the higher of the two arriving in April. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.

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Gauge details

State
South Dakota
Drainage area
7,171 sq mi
Gauge elevation
3,420 ft
Subbasin (HUC-8)
10120106
Coordinates
43.30556, -103.82056
USGS site number
06395000
Records begin
1903-07-01 (123 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Cheyenne River at Edgemont, SD. 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
14.3 111 648
3.6 27.6 216
2.2 14.2 96.4
1.2 8.6 55.1
0.9 5.6 31
0.6 4.1 23.3
0.8 10.1 167
1.2 21.4 484
1.2 21.1 256
1.2 17.5 124
0.8 12.1 77.8
0.6 8.1 52
0.7 6.7 39
0.5 4.9 28.2

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 80 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 6.4 30.3
February 0.7 17.3 99
March 10.1 51.8 347.4
April 4.5 29.8 137.8
May 3.3 31.4 421.3
June 1.8 47.1 524.5
July 0.3 20.5 277.9
August 0 10.5 146
September 0 4.7 41.6
October 0.1 8.8 47.9
November 0.5 12.2 32.5
December 0.2 7.9 25.5

All values in cubic feet per second (cfs).

Common questions

When does Cheyenne River at Edgemont, SD normally run highest?
March, on the long-term record. The median daily flow that month is about 51.8 cfs, against 4.7 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Cheyenne River at Edgemont, SD?
It depends on the month. In January, half of days historically fall near 6.4 cfs, with the middle 80% of days between 0 and 30.3 cfs. The month-by-month table on this page gives the full range.
How long has Cheyenne River at Edgemont, SD been measured?
Discharge records at USGS site 06395000 begin in 1903, about 123 years, covering roughly 9,077 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Cheyenne River at Edgemont, SD?
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 Cheyenne River at Edgemont, SD?
The gauge sits at 43.30556, -103.82056, in South Dakota, in hydrologic subbasin 10120106, at an elevation of about 3,420 feet, draining roughly 7,171 square miles.
Can I use Cheyenne River at Edgemont, SD 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 Cheyenne River

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

Other gauges in this subbasin