State ecology and ROSA district brief commissioners on Yakima Basin curtailments, storage and conservation

Department of Ecology staff and representatives of the ROSA Irrigation District gave Benton County commissioners a detailed briefing on the Yakima Basin's layered water‑rights system, recent curtailments and the local impacts of drought, and the state and basin efforts to plan for storage and conservation.

Kelsey Collins of Ecology's Water Resources program walked commissioners through the prior‑appropriation legal framework ("first in time, first in right"), the historical role of the Stevens Treaty and the Bureau of Reclamation's Yakima Project, and the way reservoir storage and senior water rights are prioritized during shortages. "When you talk about the volumes...compare that over 2 and a half million with what the reservoirs can hold, just over 1," Collins said, describing why the basin can face shortages even in years with substantial runoff.

Heather Simmons, also with Ecology Water Resources, summarized last year's historic curtailment of senior surface‑water users (exceptions included the Yakama Nation and the Wapato Irrigation Project) and described steps Ecology has taken to improve outreach: a new Yakima Basin surface‑water website, a real‑time curtailment map that allows users to search by parcel or water‑right number, and a postcard mailing to roughly 3,500 surface‑water holders to explain curtailment status and the Riverflow hotline.

An Office of Columbia River official described statewide engagement ("Washington's water future" roundtables) and a draft long‑term supply/demand forecast for the Columbia Basin now open for public comment through the end of July; staff urged local participation to inform legislative recommendations.

Scott Ravel, manager of the ROSA Irrigation District, and board members described district‑level effects: ROSA manages roughly 72,000 irrigated acres, about 40% of which are in Benton County (an estimated 27,000 irrigated acres). Ravel said the district has invested tens of millions in on‑farm and system conservation (piping, reregulating reservoirs, fish screens) and that curtailments and low carryover storage forced early shutdowns in recent seasons. "Every percentage point in our district when we're down...is about four days of running time," Ravel said, explaining how small changes in supply affect delivery windows.

District presenters discussed potential storage options included in the Yakima Basin Integrated Plan (notably the Springwood site, under geotechnical study) and emphasized that new storage is technically and politically complex and expensive. They also outlined farmer responses such as fallowing, conversion to drip irrigation and coordinated water‑leasing strategies among growers.

Why it matters: The presentations clarified why curtailments occur, how the state and basin are improving notice and tools for water‑right holders, and how drought and operational decisions in the Yakima Basin translate into real delivery, economic and ecological effects for Benton County growers and communities.

What happens next: Ecology and the Office of Columbia River invited public comment on the draft Columbia Basin forecast and said they will continue to refine curtailment tools; ROSA offered tours of conservation projects and requested continuing coordination with county staff and elected officials.