Rivermatics

USGS Streamgage 13130300

Big Lost River near Leslie, ID

Big Lost River near Leslie, ID is USGS streamgage 13130300 in Idaho, monitoring river discharge in hydrologic subbasin 17040218. It sits on the Big Lost River, alongside 8 other gauges Rivermatics tracks on the same river. It drains a watershed of about 900 square miles. Discharge records at this site go back to 2022. Typical flow runs near 355.5 cfs in July and 75.3 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
Idaho
Drainage area
900 sq mi
Subbasin (HUC-8)
17040218
Coordinates
43.85938, -113.46667
USGS site number
13130300
Records begin
2022-06-23 (4 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Big Lost River near Leslie, ID. 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
231 239 243
227 238 244
223 238 245
216 237 247
202 235 247
192 235 251
182 234 254
169 231 252
162 229 252
145 223 253
138 221 253
132 219 253
121 214 254
115 212 254

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 4 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 — 52.3 —
February — 64.4 —
March — 71.4 —
April — 75.3 —
May — 285.8 —
June — 446 —
July — 355.5 —
August — 256.5 —
September — 188.3 —
October — 110 —
November — 48.6 —
December — 52 —

All values in cubic feet per second (cfs).

Common questions

When does Big Lost River near Leslie, ID normally run highest?
June, on the long-term record. The median daily flow that month is about 446 cfs, against 48.6 cfs in November, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
How long has Big Lost River near Leslie, ID been measured?
Discharge records at USGS site 13130300 begin in 2022, about 4 years, covering roughly 1,503 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Big Lost River near Leslie, ID?
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 Big Lost River near Leslie, ID?
The gauge sits at 43.85938, -113.46667, in Idaho, in hydrologic subbasin 17040218, draining roughly 900 square miles.
Can I use Big Lost River near Leslie, ID 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 Big Lost River

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

Other gauges in this subbasin