Alright, fellow fish fanatics, let’s break down the latest on the Ruby River. In short: it’s a bit of a rollercoaster right now, mostly due to the summer heat.

Here is the lowdown, based on Montana Angler’s July 15, 2026 report on what’s happening, what’s coming, and where you can actually cast a line.

“Hoot Owl” Alert & Water Woes

If you’re planning to wade, you might want to check the gauges first. The Ruby below the dam is “managed entirely for irrigation purposes,” meaning the water levels go up and down based on who needs to water their crops. If you want to wade without swimming, you’re looking for flows around 150 cfs.

The bigger issue? It is getting hot. Starting today (July 15), Hoot Owl restrictions are officially in effect for the Lower Ruby (from Duncan District Road down to the Beaverhead confluence). That means absolutely no fishing between 2 PM and midnight. Keep it cool and leave the fish alone when the sun is blazing.

Why the strict rules? Water temperatures “exceeded 73 degrees in this reach of the Ruby River for three consecutive days starting on July 10th.” Trout get incredibly stressed in warm water, so we’ve got to give ’em a break.

The Month Ahead: Look for the Green Light

Don’t write the Ruby off just yet! July can still be fantastic “when water temps and flows are favorable for trout.” The bugs are definitely invited to the party right now—expect plenty of PMDs (Pale Morning Duns) and Yellow Sallies to get the fish looking up.

• The Golden Rule: If flows at the dam drop below 400 cfs and stay stable (or keep dropping), “this should be a green light.”
• The Menu: Sub-surface is your best bet. “Nymphing worms trailed by pmd emergers is always productive,” but don’t rule out swinging a streamer if you’re feeling adventurous.

Where Can You Actually Fish?

The Ruby is a great summer staple, though the public spots get a little crowded and the fishing can get a bit moody. Even so, “you can still have some banner days” if you play your cards right. Just make sure you know the map, because the rules change depending on where you stand:

• Upstream from Ruby Reservoir: Wide open.
• Sweetwater Creek to the Reservoir: Open (standard season through Nov 30).
• Right below Ruby Dam: STOP. “Angling is closed the entire year just below Ruby Dam” (including the outlet channel). Don’t even try it.
• Ruby Dam to Alder Bridge (Ruby Island): Open through Sept. 30.
• Alder Bridge to the Mouth: Open all year long.

Set your alarms early, watch the thermometer, and go get ’em before the 2 PM whistle blows!

For more information on Montana Angler Fly Fishing Inc. in Bozeman, MT, here is their contact information: 406-522-9854 | info@montanaangler.com
Montana Angler Fly Fishing | 435 East Main Street, Bozeman, MT 59715