Rio Grande at 0.0 cfs During Peak Irrigation Season

USGS recorded 0.0 cfs on the Rio Grande this week, dropping to zero from positive flow the prior week at peak irrigation-season demand. That zero reading is the largest single-week decline in the digest and the furthest below normal of any gauged site.

Interior West drought coverage remains well above 5-year medians per the US Drought Monitor:

• Wyoming: 98%, 52 pts above the 5-year median, flat on the week.
• Colorado: 95%, up 3 pts week over week, 54 pts above the 5-year median. The only state-level drought coverage increase this week.
• Idaho: 85%, 57 pts above the 5-year median, flat on the week.
• Klamath County: 86%, down 14 pts week over week, the biggest drought-coverage improvement in the digest. Still 49 pts above the 5-year median.
• Washington: 43%, 22 pts above the 5-year median, flat. Yakima County at 42%, 34 pts above its 5-year median.

Trinity Lake (US Bureau of Reclamation) holds at 2.10M af, 53% above the 5-year median, down 1% on the week. Millerton Lake holds at 501,166 af, 36% above the 5-year median, flat week over week. Both are running well above normal entering drawdown season.

Allocations (standing status): CVP North-of-Delta agricultural and M&I contractors remain at 100%, set by the US Bureau of Reclamation on Feb. 26, 2026. SWP stands at 45%, last revised May 1, 2026, by the Department of Water Resources. No allocation changes were announced this week.

Data note: One CVP data series flagged in the digest has not updated in over two weeks. Check current Bureau of Reclamation data before relying on that figure.