Yellowstone restricts angling on two dozen rivers

Yellowstone National Park and Montana fish managers have tightened fishing limits across a broad stretch of the Greater Yellowstone region as summer heat pushes river temperatures higher and streamflows lower. Yellowstone said on July 28 that all park rivers and streams would close to fishing each day from 2 p.m. to sunrise starting July 29, while Montana Fish, Wildlife and Parks said its latest round of restrictions brought the statewide total to 24 rivers under full or partial limits. The restrictions are aimed at reducing stress on trout during the hottest hours of the day. Yellowstone said water temperatures had exceeded 68 degrees Fahrenheit in recent days and that flows on many rivers were below long-term averages. Montana FWP uses 73 degrees as a threshold for many “hoot-owl” restrictions if that level is reached for three consecutive days, according to state materials and reporting on the latest closures. (nps.gov) ### Why are agencies cutting off afternoon fishing? Yellowstone National Park said high water temperatures and low streamflows were the immediate trigger for the parkwide afternoon closure. The agency said those conditions are “extremely stressful and can be fatal to fish,” and warned that continued hot and dry weather could force additional limits if conditions worsen. (nps.gov) Montana Fish, Wildlife and Parks uses similar logic. The agency says hoot-owl restrictions bar fishing during the warmest part of the day, generally from 2 p.m. to midnight, because trout recover poorly from catch-and-release stress in warm, oxygen-poor water. Montana Free Press reported that warmer water holds less oxygen and that temperatures above 80 degrees can lead to fish kills, citing FWP. (nps.gov) ### Which Yellowstone waters are fully closed, and which are partly open? July 15 was the date Yellowstone shifted earlier partial measures into full closures on three named rivers. The National Park Service said the Firehole and Madison rivers and their tributaries were fully closed, along with the Gibbon River and associated tributaries downstream of Norris Campground. The agency said peak water temperatures on some of those waters had reached 80 to 86 degrees Fahrenheit, and there had been reports of dead fish in the Firehole River. (fwp.mt.gov) Most other Yellowstone rivers and streams remain open only from sunrise to 2 p.m. under the July 29 rule. Yellowstone Lake and other lakes remain open from sunrise to sunset under the park’s 2026 fishing regulations, the park said. ### How broad is the Montana side of the crackdown? Montana Fish, Wildlife and Parks said on July 28 that it added 11 rivers to its latest round of restrictions, bringing the total number of affected Montana waterways to 24. (nps.gov) Montana Free Press reported that the list included all or portions of the Madison, Big Hole, Gallatin, East Gallatin, Jefferson, Upper Clark Fork, Bitterroot, Shields and Smith rivers, with new afternoon limits on portions of the Blackfoot River and Rock Creek. The state’s current waterbody page shows how those measures vary by river. As of Aug. 6, for example, the Beaverhead River had hoot-owl restrictions on a stretch starting Aug. 5, the entire Big Hole River was under hoot-owl restrictions starting July 29, and the Bitterroot River was restricted in its entirety starting July 22. ### Is this just a Yellowstone problem? (montanafreepress.org) The Associated Press reported on Aug. 1 that wildlife officials were imposing time-of-day fishing bans across the U.S. West after an exceptionally dry winter and amid widespread drought. AP said lower water levels allow rivers to heat more rapidly and described the closures as increasingly routine in Western trout fisheries. (fwp.mt.gov) Montana Free Press tied the regional stress to an unusually warm winter and weak snowpack, followed by heat that reversed gains from June and July rainstorms. FWP spokesperson Morgan Jacobsen told the outlet recent heat spells were erasing some of that relief. ### What should anglers check before they go? (wtop.com) Yellowstone told anglers to fish during the coolest times of day, land fish quickly and handle trout in the water as much as possible. The park said restrictions could be lifted, expanded or converted into additional closures depending on ongoing condition assessments. Montana Fish, Wildlife and Parks posts active drought-related fishing closures and hoot-owl restrictions on its current waterbody restrictions page, and Yellowstone posts updates through its news releases and annual fishing regulations booklet. (montanafreepress.org) As of Aug. 6, both agencies were still updating those notices as conditions changed. (fwp.mt.gov) (nps.gov)