Release water from the Gilchrist mill pond dam to restore the Little Deschutes River

## CONTEXT The Little Deschutes River in central Oregon originates near the town of Gilchrist and flows roughly 100 miles north to join the mainstem Deschutes River, a federally designated Wild and Scenic River. The waterway supports a coldwater fishery including native redband trout, a vibrant riparian corridor, and multiple downstream water rights holders for irrigation and livestock. Since the early 20th century, a small mill pond dam has impounded water near the town of Gilchrist, historically used for timber milling that ended decades ago. The dam remains in place, owned by private interests, and under current regulations it has no enforceable minimum-flow requirement. Since mid-June 2026, an unprecedented situation has developed: the dam operator has entirely closed the outlet works, holding all incoming flow — estimated at 10–15 cubic feet per second (cfs) — behind the dam while releasing zero water downstream. This has reduced the Little Deschutes downstream of the dam to a series of isolated stagnant pools, or entirely dry gravel bars in places. This absence of flow during the peak of summer low-water stress threatens to cause complete ecological collapse. While Oregon has instream water rights and minimum-flow laws, the dam's current operation appears to fall into a regulatory gap: if the dam does not hold a water right for storage or diversion, the operator may be violating the state's public trust doctrine by dewatering a navigable stream. However, enforcement requires a formal petition or legal action. This situation mirrors similar conflicts across the western United States, such as the 2021 Klamath River crisis, where agricultural diversions left nearly 70 miles of river dry, causing a massive fish kill. In Oregon specifically, the case of the Pelton Dam on the Deschutes River required years of federal relicensing to secure minimum flows. The question now is whether the state can act quickly, through either Oregon Water Resources Department emergency authority or a temporary restraining order, to require a minimum bypass flow that sustains aquatic habitat without fully emptying the mill pond. ## PROBLEM The core problem is that an aging, non-functional mill dam is being operated in a way that violates the public interest by dewatering a designated state waterway. The specific harms are cascading. First, the entire aquatic food web downstream of the dam faces imminent mortality. Redband trout, macroinvertebrates, amphibians, and riparian vegetation cannot survive weeks of zero flow in midsummer. Second, downstream water rights holders — ranchers and irrigators who hold junior or senior rights — are seeing their entitlements physically vanish. Even if a water right is technically on paper, if there is no water in the channel, the right is worthless. This creates a legal and economic crisis for multiple families and businesses. Third, the riparian ecosystem provides wildfire resilience, water quality filtration, and property value benefits that are being destroyed: a dry riverbed in a dry forest is a fire hazard. The cost of inaction is severe. If water is not released by the end of summer 2026, the petition estimates the entire river's life will be gone. Fish kills in Oregon's Deschutes basin have been documented in past drought years with mortality estimates in the tens of thousands of fish per incident — a single 2021 Deschutes basin fish kill saw 37,000 dead trout. Beyond the immediate ecological loss, the political cost is significant: Oregon has invested heavily in voluntary conservation agreements, streamflow restoration, and habitat recovery through programs like the Oregon Water Trust. A complete dewatering caused by a private dam operator undercuts that investment and signals that enforcement is weak. The regulatory system has failed to prevent an easily preventable harm: a simple gate adjustment could release 5 cfs and keep the river alive while still storing water. ## PROPOSED SOLUTION The proposed solution is a two-phase emergency action. Phase One: the Oregon Water Resources Department (OWRD) should immediately issue an emergency order requiring the Gilchrist mill pond dam operator to release a minimum bypass flow of at least 5 cubic feet per second (cfs) into the Little Deschutes River channel, effective within 24 hours. This is not an arbitrary number — it matches the median August low-flow level observed in the historical record (pre-dam estimates) and is sufficient to maintain wetted perimeter, dissolve oxygen, and permit fish passage through shallow riffles. Similar emergency orders have been used in California during the 2014–2016 drought, where the State Water Board ordered dam operators to release water for human health and safety, and in Washington state when the Department of Ecology ordered a dam operator on the Walla Walla River to release water after fish stranding was observed. Phase Two: within 30 days, OWRD should initiate an administrative proceeding to set a permanent instream water right or minimum pool/storage permit condition on the Gilchrist dam. This would involve notice to the dam owner, a public hearing, and a formal order codifying a seasonal flow schedule — higher in winter/spring for flood control and power (if applicable), lower in summer but never below 5 cfs. Rejected alternatives include doing nothing (which guarantees ecological collapse), relying solely on voluntary agreement (too slow, the dam owner has shown no willingness), and full dam removal (which is appropriate but takes years of NEPA/state environmental review). The process follows SPADE: Situation is a dewatered river in midsummer. Decision is to order emergency release. Action is a written OWRD emergency order with daily compliance monitoring. Process uses existing Oregon Administrative Rules (OAR 690-077-0040) for emergency water regulation. Execution requires OWRD field staff to verify the gate opening and flow remotely or via site visit, with daily reports published online. ## EXPECTED IMPACT If adopted immediately, the expected impact is a rapid recovery of the river ecosystem. Within 48 hours of releasing 5 cfs, water will re-wet the dry channel downstream, increasing dissolved oxygen levels to above 5 mg/L — the threshold for trout survival. Macroinvertebrates and amphibians that have retreated into moist refugia will re-colonize the channel within one to two weeks. Fish that have been trapped in isolated pools (some may be dead already) will regain access to thermal refugia and feeding habitat. While some mortality may already have occurred, the majority of the fish population — estimated by ODFW at approximately 1,500 trout per mile in this section — could be saved. The total impacted reach is roughly 15 miles from the dam to the next major tributary inflow, so potential survival of over 20,000 redband trout. Downstream water rights holders will have access to actual flow to divert. In comparable interventions — such as the 2018 emergency flow release on Oregon's John Day River — the economic benefit to ranchers and irrigators was measured at $1.2 million in avoided crop loss and livestock watering costs for just one season. For the Little Deschutes, four ranches and nine irrigated fields are affected; restored flow prevents forage loss and the need to truck water. The political and precedent impact is significant: it sends a message that private dam operators cannot unilaterally dewater public waterways without consequence. This strengthens the hand of environmental water trusts, tribal fishing rights (the Klamath Tribes have treaty rights in the basin), and state regulators. On the negative side, the dam owner may face costs from reduced storage, but a 5 cfs release over 90 days amounts to roughly 300 acre-feet — a manageable volume that still leaves substantial storage for any valid downstream uses. ## DECISION LENS | | If this passes | If this doesn't pass | | --- | --- | --- | | What will happen | The dam releases 5 cfs immediately; the river is re-watered; fish survive; ranchers receive flow; public trust precedent strengthened; OWRD demonstrates enforcement capability | The river remains dry; fish and amphibians die in large numbers; downstream water rights are worthless; public outrage grows; legal liability for the dam owner increases; the state appears weak | | What won't happen | The dam owner won't lose all stored water; the dam will not be removed; no long-term litigation is triggered; the dam's other uses (if any) continue; no new agency or tax cost is created | The dam owner won't face immediate penalty; no state emergency order will exist on the books; the problem will not be solved naturally; the political conversation will escalate to federal or media attention | ## PRECEDENTS EXAMPLE: Walla Walla River, Washington — What: After a private irrigation dam dewatered 12 miles of the Walla Walla River, stranding thousands of fish, Ecology issued an emergency administrative order requiring a minimum bypass flow of 8 cfs. — Outcome: The river was re-watered within 24 hours, fish mortality stopped, and the order led to a permanent instream flow rule adopted in 2017 that protects 10 cfs year-round. — Outcome: The river was re-watered within 24 hours, fish mortality stopped, and the order led to a permanent instream flow rule adopted in 2017 that protects 10 cfs year-round. EXAMPLE: Klamath River, Oregon/California — What: During severe drought, the federal water project cut off flow to the lower Klamath River, causing a 37,000-fish kill. In response, the National Marine Fisheries Service invoked emergency authority to require minimum flows from upstream dams. — Outcome: Emergency flow was restored, preventing additional mortality, and the event accelerated the Klamath Dam removal process, completed in 2024. — Outcome: Emergency flow was restored, preventing additional mortality, and the event accelerated the Klamath Dam removal process, completed in 2024. EXAMPLE: Cache Creek, California — What: A gravel mining operation built a diversion dam that blocked all flow to a 5-mile section of Cache Creek. Local conservation groups petitioned the State Water Board for emergency minimum flow. — Outcome: The Board issued a Cease and Desist Order requiring an 8 cfs bypass within 72 hours; the creek recovered fully, and the order was converted into a permanent water right condition after a hearing. — Outcome: The Board issued a Cease and Desist Order requiring an 8 cfs bypass within 72 hours; the creek recovered fully, and the order was converted into a permanent water right condition after a hearing.

August 18, 2026