Top 5 Colorado Rivers Fishing This Week | May 2026

The Arkansas River is currently flowing at 287 cfs (normal) with a falling trend. Flows are fishable today. The Verdict: Excellent Conditions This week’s forecast shows temperatures ranging from 58-76°F. Calm winds make indicator nymphing more effective.

Insect Activity: Late May finds the Arkansas at Buena Vista in that prime window after peak runoff, with worm patterns dominating as displaced earthworms flush through the system at 287 cfs. The Squirmy Worm in pink or red on a #12 hook is your bread-and-butter right now — dead-drift it through the deeper seams near current edges where brown trout stack up waiting for easy calories. As flows continue their moderate decline, watch for Garcia’s Mother’s Day Caddis activity in the late afternoon around size #16, with trout starting to show in the flats.

Where to Fish: At 287 cfs, the stretch downstream of the Buena Vista whitewater park through the Fisherman’s Bridge corridor is wading nicely — knee-to-thigh-deep riffles with well-defined current seams. Target the tail-outs of the larger pools where fish are positioned to intercept drifting worms and emerging caddis pupae without burning energy in the main current. Work your way upstream methodically; the 12-to-18-inch cutbows and rainbows in this reach prefer the bubble-line just off the heaviest flow.

Gear Tip: Start with a streamer rig in softer edges. Switch to a two-fly nymph rig and a yarn indicator as flows settle. A 9-foot 5X leader with light tippet keeps the rig natural in these flows.

Presentation: Start shallow, then add weight or depth as you move into deeper runs and pockets. Use longer drifts to cover tailouts and seam water.

Regulations: From the confluence with the Lake Fork of the Arkansas near Leadville downstream to Parkdale at the U.S. 50 bridge crossing above the Royal…

The Arkansas River is currently flowing at 451 cfs (normal) with a stable trend. Flows are fishable today. The Verdict: Excellent Conditions This week’s forecast shows temperatures ranging from 53-71°F. Calm winds make indicator nymphing more effective.

Insect Activity: Big Horn Sheep Canyon is running 451 cfs — higher than Buena Vista upstream, which reflects the added drainage volume through the canyon. Worm patterns are still the most consistent producers at this flow, but don’t overlook the Grillos’ Dancin’ Ricky in orange/black (#6) as a stonefly nymph imitation tumbled along the rocky bottom. The canyon walls create a wind tunnel effect in the afternoon that funnels naturals downstream, so time your dry fly work for that 3–5pm window when caddis adults skitter across the surface.

Where to Fish: With 451 cfs pushing through, wading is possible but should be approached carefully — this canyon stretch rewards those who pick their lines through the boulderfield pockets rather than crossing main channels. Focus on the slower inside bends and the large protected eddies that form behind the canyon’s signature car-sized boulders; that’s where fish hold in high water without fighting the current. If you have a raft or hard-shell kayak, floating from Coaldale to Parkdale opens up the middle canyon pools that wade anglers rarely reach.

Gear Tip: Start with a streamer rig in softer edges. Switch to a two-fly nymph rig and a yarn indicator as flows settle. A 9-foot 5X leader with light tippet keeps the rig natural in these flows.

Presentation: Start shallow, then add weight or depth as you move into deeper runs and pockets. Use longer drifts to cover tailouts and seam water.

Regulations: From the confluence with the Lake Fork of the Arkansas near Leadville downstream to Parkdale at the U.S. 50 bridge crossing above the Royal…

The Bear Creek is currently flowing at 27 cfs (normal) with a stable trend. Flows are fishable today. The Verdict: Excellent Conditions This week’s forecast shows temperatures ranging from 64-82°F. Calm winds make indicator nymphing more effective.

Insect Activity: Bear Creek is running a low-but-fishable 27 cfs through the Evergreen corridor — gin-clear water that calls for your lightest tippet and a stealthy approach. The Mother’s Day Caddis hatch may be winding down but adult caddis are still fluttering off the water in early morning and again around dusk, making a size #16 Silvey’s Caddis Pupa the smart nymphing choice through the runs below the lake dam. Midges are reliable all day in the flats — a Griffith’s Gnat (#20) on a long 6X leader will fool the sippers working the slow current edges.

Where to Fish: In the artificial-only, catch-and-release section from Evergreen Lake Dam downstream, the small pools and undercut banks demand a stealthy upstream approach — shadows on this water at 27 cfs will put fish down immediately. Work the creek-width riffles that transition into short flat pools, positioning your nymph rig to tick along the bottom in 18 to 24 inches of water; brook trout claim the faster pocket water higher up while browns and rainbows favor the seam water just downstream of each riffle. Early morning before 9am is your best window before hikers and dogs pressure the streamside trail.

Gear Tip: Start with a streamer rig in softer edges. Switch to a two-fly nymph rig and a yarn indicator as flows settle. A 9-foot 5X leader with light tippet keeps the rig natural in these flows.

Presentation: Start shallow, then add weight or depth as you move into deeper runs and pockets. Use longer drifts to cover tailouts and seam water.

Regulations: Artificial flies & lures only; Catch and release required

The Boulder Creek is currently flowing at 84 cfs (normal) with a stable trend. Flows are fishable today. The Verdict: Excellent Conditions This week’s forecast shows temperatures ranging from 59-77°F. Calm winds make indicator nymphing more effective.

Insect Activity: Boulder Creek at 84 cfs is in ideal late-May shape for both the canyon and urban sections, and the PMD and Blue-Winged Olive hatches are the story right now — look for BWO spinners in the late afternoon calm just before thunderstorms roll in. Fish a size #22 Sparkle Dun or Parachute BWO on the surface, but keep a Barr’s Emerger (#24) and RS2 (#22) in your nymph rig for the subsurface feeders that won’t commit to a full rise. The Klinkhammer Special in size #18 is a reliable emerger pattern when you can see fish actively working the meniscus.

Where to Fish: The canyon section in Boulder Canyon above Eben G. Fine Park holds the largest fish on the creek — pocket water demanding tight-loop casts into the plunge pools below each cascade, where browns up to 16 inches ambush drifting nymphs. In the urban catch-and-release section through Boulder, the stretch from Eben G. Fine to 28th Street produces consistent dry fly action in the wider, slower runs — wade quietly in the gravel shallows and cast upstream to rising fish rather than wading through their feeding lanes. Afternoon thunderstorm risk is moderate this week, so plan your canyon session for early morning and move to the more open urban reach after lunch.

Gear Tip: Start with a streamer rig in softer edges. Switch to a two-fly nymph rig and a yarn indicator as flows settle. A 9-foot 5X leader with light tippet keeps the rig natural in these flows.

Presentation: Start shallow, then add weight or depth as you move into deeper runs and pockets. Use longer drifts to cover tailouts and seam water.

Regulations: Array

The Clear Creek is currently flowing at 222 cfs (normal) with a stable trend. Flows are fishable today. The Verdict: Excellent Conditions This week’s forecast shows temperatures ranging from 63-81°F. Calm winds make indicator nymphing more effective.

Insect Activity: Clear Creek is showing a slight 2% rise at 222 cfs — still within normal range but with enough recent-runoff energy to keep worm patterns extremely productive all day long. A pink Squirmy Worm (#12) beneath an indicator in the deep runs has been the call for the last few weeks, and that’s not changing yet. By mid-afternoon, Mother’s Day Caddis adults are cycling off the water and the Green Weenie (#12) fished as a caddis larva imitation in the riffle tailouts starts connecting; transition to an Elk Hair Caddis dry once you see adults visibly bouncing on the surface around 4pm.

Where to Fish: The stretch from the Golden area downstream through the canyon offers the most varied wading on this creek — rocky runs transition into wide gravel bars that are easy to navigate at current flows, and you can cover a lot of water moving upstream through the riffle-pool-riffle sequence. Key on the seams where fast and slow water meet, especially the inside edge of current bends where washed-out worms and debris collect; that’s where the 10-to-14-inch rainbows and browns station up without fighting the full current force. The tailout of any pool longer than 30 feet is worth a patient presentation — that’s where fish stage to intercept caddis pupae drifting into slower water before emerging.

Gear Tip: Start with a streamer rig in softer edges. Switch to a two-fly nymph rig and a yarn indicator as flows settle. A 9-foot 5X leader with light tippet keeps the rig natural in these flows.

Presentation: Start shallow, then add weight or depth as you move into deeper runs and pockets. Use longer drifts to cover tailouts and seam water.

Regulations: Daily bag limit: 4 trout (in aggregate), 8 in possession. Brook trout 8 inches or less: 10 additional per day (in addition to trout…