Snake River at Anatone, WA
USGS gauge 13334300 · drainage 92,960 sq mi · observed Oct 16, 6:15 PM PDT · 65 min old
Last 7 days Live gauge
Source: USGS Water Data API (continuous values), observed to Oct 16, 6:15 PM PDT. Shaded band: 25th to 75th percentile of USGS daily statistics for each date; dashed: median. Flow in cfs.
Rate of rise and fall Live gauge
| Window | Flow then | Change to latest | Gage height then | Gage height change |
|---|---|---|---|---|
| 1 h | 13,400 cfs | ▬ +0.00 cfs (+0.0%) | 3.36 ft | +0.01 ft |
| 3 h | 13,400 cfs | ▬ +0.00 cfs (+0.0%) | 3.35 ft | +0.02 ft |
| 6 h | 13,300 cfs | ▬ +100 cfs (+0.8%) | 3.34 ft | +0.03 ft |
| 12 h | 13,400 cfs | ▬ +0.00 cfs (+0.0%) | 3.36 ft | +0.01 ft |
| 24 h | 13,300 cfs | ▬ +100 cfs (+0.8%) | 3.34 ft | +0.03 ft |
Last 7 days
| Measure | Flow | Time | Relative to latest reading |
|---|---|---|---|
| Highest reading | 14,300 cfs | Oct 10, 8:30 AM PDT | 154 h earlier |
| Lowest reading | 12,400 cfs | Oct 10, 9:45 PM PDT | 140 h earlier |
Source: computed from USGS continuous readings (Water Data API) to Oct 16, 6:15 PM PDT. Each row compares the latest reading with the reading closest to that many hours earlier; the arrow is steady (▬) when the change is within 1%.
Daily mean flow Live gauge
| Date (gauge-local) | Mean flow | Note |
|---|---|---|
| Oct 16, 2026 | – | Partial day |
| Oct 15, 2026 | 13,328 cfs | |
| Oct 14, 2026 | 13,268 cfs | |
| Oct 13, 2026 | 12,994 cfs | |
| Oct 12, 2026 | 12,561 cfs | |
| Oct 11, 2026 | 12,507 cfs | |
| Oct 10, 2026 | 12,898 cfs | |
| Oct 9, 2026 | 13,202 cfs | |
| Oct 8, 2026 | – | Partial day |
Source: USGS Water Data API (continuous values); each mean uses readings on that gauge-local date, shown only with at least 80% of expected readings.
The same 50 days in earlier years Historical record
━ 2026 ╌ 2025 ╌ 2024 ╌ 2023
| Year | Mean flow | Highest day |
|---|---|---|
| 2026 | 13,748 cfs | 15,400 cfs |
| 2025 | 15,366 cfs | 19,200 cfs |
| 2024 | 15,074 cfs | 16,500 cfs |
| 2023 | 17,084 cfs | 19,600 cfs |
Source: USGS daily mean flows (Water Data API). Each line is the 50 days from Aug 27 to Oct 15, shifted to the same calendar dates in earlier years; gaps are days without a published value. Recent days are provisional.
Compared with this gauge’s record Historical record
| Measure | Value | When or rank |
|---|---|---|
| Peak daily flow, last 7 days | 13,300 cfs | Oct 14, 2026 |
| Last time daily flow was this high or higher | 13,600 cfs | Oct 4, 2026 (10 days earlier) |
| Last day above the 90th percentile for its date, before this peak | Dec 28, 2025 | 10 months earlier |
| Days above the 75th percentile for their date | 0 of 30 | last 30 days |
| October 1 to 15, mean flow | 13,360 cfs | rank 67 highest of 69 years |
| Peak daily mean compared with annual instantaneous peaks of record | Below the lowest of 67 | lowest annual peak 38,000 cfs |
Source: USGS daily mean flows (Water Data API), 1958 to 2026 (24,922 days), data through Oct 15, 2026, computed 2026-10-17; method record-v1. Percentiles are USGS daily statistics. Recent days are provisional.
Largest annual peaks Historical record
Ten largest peaks of record
| Date | Peak flow | Gage height at peak |
|---|---|---|
| Jun 18, 1974 | 195,000 cfs | 24.45 ft |
| May 31, 1984 | 183,000 cfs | 23.39 ft |
| Jan 2, 1997 | 179,000 cfs | 22.76 ft |
| Jun 5, 2010 | 173,000 cfs | 22.18 ft |
| May 27, 1998 | 169,000 cfs | 21.82 ft |
| Jun 1, 1986 | 159,000 cfs | 21.20 ft |
| May 31, 2003 | 156,000 cfs | 20.53 ft |
| May 27, 1999 | 152,000 cfs | 20.19 ft |
| May 29, 1971 | 151,000 cfs | 19.98 ft |
| Jun 10, 1996 | 151,000 cfs | 20.10 ft |
Five most recent annual peaks
| Date | Peak flow | Gage height at peak |
|---|---|---|
| May 13, 2025 | 86,900 cfs | 13.63 ft |
| May 16, 2024 | 78,900 cfs | 12.77 ft |
| May 23, 2023 | 128,000 cfs | 17.93 ft |
| Jun 12, 2022 | 116,000 cfs | 16.71 ft |
| Jun 5, 2021 | 53,900 cfs | 9.92 ft |
Source: USGS annual peak streamflow (Water Data API), 67 annual peaks, 1959 to 2025. A water year's peak is its highest instantaneous flow.
Historic crests Official NWS
| Date | Crest stage | Flow |
|---|---|---|
| Jun 17, 1974 | 24.45 ft | 195,000 cfs |
| May 30, 1984 | 23.39 ft | 183,000 cfs |
| Jan 1, 1997 | 22.76 ft | 179,000 cfs |
| Jun 5, 2010 | 22.18 ft | 173,000 cfs |
| May 26, 1998 | 21.82 ft | 169,190 cfs |
| May 31, 1986 | 21.20 ft | 159,000 cfs |
| May 30, 2003 | 20.53 ft | 156,000 cfs |
| May 17, 1997 | 20.37 ft | 153,900 cfs |
| May 30, 1983 | 20.25 ft | 150,000 cfs |
| May 26, 1999 | 20.19 ft | 152,000 cfs |
Source: National Weather Service forecast point ANAW1 (Snake River (WA) near Anatone), historic crests as published by the NWS; the NWS may have recorded them on an older gauge datum. The USGS annual peaks above are a separate record and can differ in date, flow and datum.
Gage height to flow rating Historical record
Line: current USGS rating, gage height (ft, horizontal) to flow (cfs, vertical). ● latest reading, 3.37 ft and 13,400 cfs.
Source: USGS rating table for the gauge (NWIS rating depot, expanded shifted rating, 2,291 rows, thinned to 93 points), fetched Oct 16, 7:11 PM PDT. Ratings are provisional and change with the channel.
Snow water equivalent at nearby SNOTEL stations Weather station
| Station | Distance | Elevation | Snow water now | Median for date | Of median | Date |
|---|---|---|---|---|---|---|
| Sourdough Gulch | 22 mi | 3,960 ft | 0.0 in | 0.0 in | – | Oct 15, 2026 |
| Spruce Springs | 27 mi | 5,690 ft | 0.0 in | 0.0 in | – | Oct 15, 2026 |
Source: USDA Natural Resources Conservation Service SNOTEL stations within 37 miles of the gauge (AWDB web service), fetched Oct 16, 6:43 PM PDT. Provisional data; stations may not drain to this gauge.
Water temperature by month Historical record
Source: USGS daily mean water temperature (parameter 00010, Water Data API), 1994 to 2023, mean of all published daily values in each calendar month (days counted under each month; (few) means fewer than 150 daily values).
Flood stages Official NWS
| Category | Gage height (ft) |
|---|---|
| Action | 19.0 ft |
| Minor | 20.0 ft |
| Moderate | 23.0 ft |
| Major | 24.0 ft |
Source: National Weather Service forecast point ANAW1 (Snake River (WA) near Anatone), fetched Oct 16, 7:15 PM PDT. Compare with the gage height above; thresholds belong to that forecast point.
Flood impacts by stage Official NWS
| Stage | National Weather Service impact statement |
|---|---|
| 18.5 ft | The river will flood the levee bike path between Asotin and Clarkston. |
| 20.0 ft | The river will flood sections of Snake River Road between Asotin and Rogersburg in Asotin County. Potential for flooding of the football field at Chief Looking Glass Park in Asotin, Washington. |
| 22.0 ft | Heller Bar parking lot may start to flood. |
Source: National Weather Service forecast point ANAW1 (Snake River (WA) near Anatone). Statements are quoted from the NWS and describe that forecast point.
Sources and method
- Data: U.S. Geological Survey. Terms
- River forecasts and flood stages: National Weather Service. National Water Model guidance: NOAA. Terms
- Snow data: U.S. Department of Agriculture, Natural Resources Conservation Service. Terms
USGS daily statistics, downloaded 2026-10-12
Percentile method: trailing 24 h mean vs USGS daily percentiles for calendar date 10-16.
Percentile is estimated from USGS published daily percentiles. Readings are provisional until USGS reviews them. Not endorsed by USGS, NOAA or the National Weather Service. Not for navigation or safety-of-life decisions; the absence of an alert is not a statement that conditions are safe.