Antero Reservoir Closed in 2026? Where Colorado Stillwater Anglers Are Going Instead

Antero is closed for 2026. If it was your home water, that's a real disruption. Drought-driven drawdown by Denver Water. The reservoir comes off the schedule until it refills, possibly 2027, possibly later. There's no "they'll figure something out" version of this. The water is being moved to Cheesman to keep it from evaporating.

Which means thousands of Colorado fly anglers — including a lot of my regular clients — are looking for somewhere else. So this is the pivot guide I've been giving people on the phone all spring, written down. Where to go, how those waters fish, and what to do when the patterns travel and the water doesn't.

Why Antero Is Closed

Antero closes to all recreation on May 13, 2026. Per Denver Water's announcement, the utility is draining the reservoir down to its dam pool to move that water into Cheesman before evaporation costs another several thousand acre-feet during one of the worst snowpack years on record. CPW is relocating fish out of Antero before the gates close. After that, it's done. Could be 2027 before the reservoir refills enough to reopen. Could be longer.

I covered the closure logistics in a separate post — go read that if you want the full picture, including what may happen to the trophy browns and the muskie population that took years to grow. This post is about where to go in 2026.

Spinney Mountain — The Obvious Move

Spinney Mountain is the obvious move. It's the closest thing to a one-for-one substitute Antero has — same elevation band, same chironomid biomass, same trophy potential. I'm redirecting my Antero clients to Spinney — your guide probably is too.

But here's the hot take nobody wants to hear: most anglers fish Spinney from the bank, and they're missing 80% of the productive water. The reservoir's bigger than it looks. The shoreline drops are decent — early-season stuff in 8 to 12 feet from the western flats works fine. But the real fish, the 24-inch class cutbows that put Spinney on the map, hold over the deeper humps and shelves out past where you can wade. Boat or float tube changes everything. If you don't have either, the bank still produces — just understand the ceiling. You're working a slice of a much bigger water.

Pattern-wise: chironomids first, callibaetis second once the hatches kick in. Standard South Park program — Chocolate Gold, Snow Cone, Chirono'midge in #14–16. Set your bottom fly 1–2 feet off the lake floor and start working up. (We have a whole post on how to actually dial in chironomid depth because that's the part most anglers skip.)

For when the chironomids slow — late June through August — switch to a balanced leech program. Olive, black, wine. Balanced leeches under indicators in 8–14 feet is my go-to when the bite gets technical.

Eleven Mile — The Underrated Pivot

Eleven Mile is the underrated pivot. It's bigger than Spinney, deeper than Antero, and the forage profile is different enough that the same tactics need a few adjustments. The fish run heavy — rainbow, cutbow, and brown — and they sit on cooler water through the heat of the summer when shallower reservoirs heat up. That's the case for going there in July and August when Spinney goes off the boil.

What changes: you fish deeper. Indicator rigs that are 12 feet at Spinney are 16 to 20 feet here. Leech patterns become a bigger percentage of the box than chironomids during the summer months. Eleven Mile has boat ramp access too — check current status before you go.

If you've fished Antero and want a similar pace — slower, more methodical, fewer screaming runs but bigger average fish — this is your move. Read our complete Eleven Mile guide for access points, depths, and seasonal timing.

North Park — Solitude Over Crowds

For the willing-to-drive crowd, North Park is where I'm sending clients who want solitude over crowds. Delaney Buttes and Lake John are about three hours from Denver — call it the same drive as Antero plus another hour. The fishing trades the convenience for being one of maybe ten anglers on the water on most days, even in May.

Delaney is actually three lakes — North, South, and East Butte — managed under special trophy regulations that have produced consistent 20-inch class browns and rainbows for years. Lake John sits a few miles away, rich water with a slower pace. The fish grow heavy, fight hard, and key on the same chironomid program that produces in South Park. The bug life mix is different — more damsels, more leeches in the diet — but the indicator-and-chironomid skeleton is the same.

The honest tradeoff: it's a haul. If you're driving up Saturday morning to fish a half day, it's not the move. If you can make a weekend of it or you're cool starting at 5 a.m., this is one of Colorado's best-kept secrets and 2026 is a great year to discover it. Read about Delaney Buttes & Lake John for tactics and access.

The Wyoming Run

Beyond North Park, the next jump is Wyoming. The North Platte chain — Seminoe, Pathfinder, and the Miracle Mile section between them — is genuinely world-class water. Big browns, big rainbows, fewer fly anglers than Colorado's Front Range stillwaters, and a different rhythm: more wind, bigger fish on average, a longer driving commitment.

This isn't a casual day-trip move. Plan it like you'd plan a destination trip — multiple days, gear for variable weather, and a real plan for the water. Seminoe in particular fishes more like a Pacific Northwest stillwater than a Rocky Mountain one — sprawling, deep, heavily wind-influenced.

If you're considering a Wyoming run as your Antero replacement, my honest advice: don't make it your only option. Pair it with a Spinney or Eleven Mile day so you've got Plan A and Plan B. Wyoming wind can shut a trip down faster than anything in Colorado.

The Pattern Playbook

What travels: chironomids, leeches, balanced leeches, and callibaetis nymphs. What changes: the proportions and the depth.

Chironomids are the universal language. From Spinney to Eleven Mile to Lake John to Seminoe, chironomid pupae are the dominant food source most of the year. Standard Colorado fly box covers it — Chocolate Gold, Snow Cone, Chirono'midge, Burnt Wino in #12–18. The differences are color (darker on stained Wyoming water) and size (smaller in clearer high-altitude lakes).

Balanced leeches are the trophy producer when chironomids slow down. Eleven Mile and Lake John especially fish well on a balanced leech program July through September. Olive and black, occasional wine. Read the full balanced leech post if you haven't fished them under indicators before.

Callibaetis come into play late June through August on Spinney and Eleven Mile. Smaller, more specific, and the action's surface-oriented when it's on. Bring a few callibaetis emergers in #16, but don't expect to need them every trip.

Water temperature matters more than calendar date this season. Antero's drawdown is happening because of low snowpack, and that same low snowpack is warming the other South Park lakes earlier than usual. Plan to fish deeper earlier than you would in a normal year. If your indicator rig was 8 feet on Memorial Day at Spinney last year, plan on 12 this year.

The Bottom Line

Antero will come back. Reservoirs do — eventually. In the meantime, the best Colorado stillwater fly fishing isn't gone, it's redistributed. Spinney is the obvious move. Eleven Mile rewards a slower pace. North Park trades drive time for solitude. Wyoming demands a real trip but pays in fish size.

The patterns travel. The tactics travel. The water doesn't have to be Antero for the day to be good. Every angler I've redirected this spring is on fish — most of them on patterns that came out of the same fly box they were going to fish at Antero.

Tight lines. Shop the stillwater patterns that fish all four pivots, or book a guided day when you want a fast track to making them work.