1. Research & Data
  2. Monitoring & Assessment
  3. River & Stream Monitoring
  4. Flow Monitoring
  5. Statewide Map
  6. Instream Flow Data

Instream Flow Data


Water Resource Inventory Area (WRIA)

Find data for WRIAs with established instream flows using the pull-down menu above this map. Select gage stations / control points on the map or in the table below it for data and graphs comparing legal instream flow amounts to actual water levels for each station.


Water availability in your WRIA
We are posting water availability focus sheetsopen_in_new for each WRIA in the state so you can learn more about the key factors affecting water availability.

Note: Some of these focus sheets are still being developed. If you don’t see a link to information for the WRIA you’re looking for, check back soon.

USGS control points and Ecology gaging stations

Visit Site Agency Station ID Station Name Reported flow Minimum flow Below min flow Reported on Water year graph Seven day graph
USGS 14013000 Mill Cr. nr Walla Walla 181.00 5/8/2024 station 14013000 water-year graph image station 14013000 seven-day graph image
ECY 32A100 Walla Walla R. @ E. Detour Rd. 660.00 5/8/2024 station 32A100 water-year graph image station 32A100 seven-day graph image
ECY 32B100 Touchet R. @ Bolles 205.00 5/8/2024 station 32B100 water-year graph image station 32B100 seven-day graph image
ECY 32E050 N.F. Touchet R. abv Dayton 119.00 5/8/2024 station 32E050 water-year graph image station 32E050 seven-day graph image

About instream flows

Instream flowsopen_in_new are an amount of water, established by rule and court decisions, in a given river or stream. They usually vary from month to month, since seasonal changes cause natural streamflow to vary. These graphs compare the legal instream flow amounts to actual water levels. When actual streamflows drop below the adopted instream flow levels, junior water rightsopen_in_new (those established after the instream flow) can be temporarily interrupted to keep the water in the stream.

In your watershedopen_in_new contains more information about all 62 Washington watersheds, also called WRIAs. See our lookup toolopen_in_new to find your WRIA.