USGS Streamgage 06208500
Clarks Fork Yellowstone River at Edgar, MT
Clarks Fork Yellowstone River at Edgar, MT is USGS streamgage 06208500 in Montana, monitoring river discharge in hydrologic subbasin 10070006. It sits on the Clarks Fork Yellowstone River, alongside 1 other gauge Rivermatics tracks on the same river. It drains a watershed of about 2,045 square miles. Discharge records at this site go back to 1921. Typical flow runs near 1,765.8 cfs in July and 491.6 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
- Montana
- Drainage area
- 2,045 sq mi
- Gauge elevation
- 3,452 ft
- Subbasin (HUC-8)
- 10070006
- Coordinates
- 45.46571, -108.84411
- USGS site number
- 06208500
- Records begin
- 1921-07-29 (105 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Clarks Fork Yellowstone River at Edgar, MT. 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.
| Date | Low p10 | Expected p50 | High p90 | Range |
|---|---|---|---|---|
| 220 | 240 | 259 | ||
| 210 | 234 | 256 | ||
| 201 | 227 | 253 | ||
| 196 | 224 | 254 | ||
| 192 | 221 | 254 | ||
| 189 | 220 | 258 | ||
| 188 | 223 | 267 | ||
| 189 | 228 | 284 | ||
| 186 | 228 | 297 | ||
| 181 | 225 | 303 | ||
| 178 | 225 | 324 | ||
| 174 | 223 | 340 | ||
| 172 | 224 | 368 | ||
| 170 | 224 | 375 |
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 105 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 | 248.2 | 360.6 | 472.3 | |
| February | 246.1 | 350.3 | 466.1 | |
| March | 251.6 | 354.3 | 512.2 | |
| April | 312.1 | 491.6 | 963.4 | |
| May | 799.7 | 1,894.2 | 3,998.4 | |
| June | 2,014 | 3,720.7 | 7,042 | |
| July | 590.5 | 1,765.8 | 3,581.3 | |
| August | 169.1 | 482.7 | 1,083.9 | |
| September | 201 | 397.3 | 773.8 | |
| October | 331.3 | 531.2 | 812 | |
| November | 378.5 | 516.5 | 670.7 | |
| December | 275.6 | 422.9 | 553.7 |
All values in cubic feet per second (cfs).
Common questions
- When does Clarks Fork Yellowstone River at Edgar, MT normally run highest?
- June, on the long-term record. The median daily flow that month is about 3,720.7 cfs, against 350.3 cfs in February, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Clarks Fork Yellowstone River at Edgar, MT?
- It depends on the month. In January, half of days historically fall near 360.6 cfs, with the middle 80% of days between 248.2 and 472.3 cfs. The month-by-month table on this page gives the full range.
- How long has Clarks Fork Yellowstone River at Edgar, MT been measured?
- Discharge records at USGS site 06208500 begin in 1921, about 105 years, covering roughly 9,200 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Clarks Fork Yellowstone River at Edgar, MT?
- 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 Clarks Fork Yellowstone River at Edgar, MT?
- The gauge sits at 45.46571, -108.84411, in Montana, in hydrologic subbasin 10070006, at an elevation of about 3,452 feet, draining roughly 2,045 square miles.
- Can I use Clarks Fork Yellowstone River at Edgar, MT 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 Clarks Fork Yellowstone River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Clarks Fork Yellowstone River in full.
- Clarks Fork Yellowstone River near Belfry, MT 1,153 sq mi
- Clarks Fork Yellowstone River at Edgar, MT this page