Drive fifteen minutes north of Suncadia on State Route 903 — through Roslyn, past Ronald — and the trees suddenly open onto the Upper Kittitas County’s biggest body of water. Cle Elum Lake stretches more than seven miles up the valley toward Salmon La Sac, ringed by national forest and backed by Cascade peaks.

It’s a swimming hole, a kokanee fishery, a paddling destination, and — because it’s also a working irrigation reservoir — a lake that transforms dramatically with the seasons. This guide covers how to enjoy it, when to go, and what to know before you drive up.

Cle Elum Lake sits about seven miles northwest of the town of Cle Elum at roughly 2,240 feet of elevation at full pool. When it’s full — typically late spring into early summer — it covers around 4,600 surface acres, runs 7.4 miles long and up to a mile wide, and reaches depths of about 200 feet.

The east shore, where Highway 903 (Salmon La Sac Road) runs, holds nearly all the developed access: Wish Poosh Campground and boat launch, the Speelyi Beach day-use area, and a Washington Department of Fish and Wildlife water access site. Almost everything else around the lake is Okanogan-Wenatchee National Forest, managed by the Cle Elum Ranger District.

One thing to understand up front: this is a Bureau of Reclamation irrigation reservoir, and the water level swings enormously — often more than 100 feet between early-summer full pool and the late-fall low. A July visit and an October visit can feel like two different lakes. Plan accordingly, especially for boating.

From Suncadia or Cle Elum, take SR 903 north through Roslyn and Ronald. The highway reaches the lake’s southeast shore a couple of miles past Ronald and follows it north as Salmon La Sac Road. From the Suncadia roundabout it’s about 15 minutes to Wish Poosh; from downtown Cle Elum, closer to 20. From Seattle, take I-90 east to Exit 80 (Roslyn/Salmon La Sac), then follow SR 903 — about 90 minutes total in normal traffic.

There are no stores, gas stations, or services at the lake itself. Stock up in Cle Elum or Roslyn on the way — or grab picnic provisions in Roslyn, then finish the day with dinner back in town. (Our Roslyn restaurant guide and Cle Elum restaurant guide can help with that part.)

The go-to swimming spot is Speelyi Beach, a day-use area on the southeast shore near Wish Poosh. It’s the closest thing the lake has to a classic beach day: gradual entry, room to spread out, and picnicking nearby. On hot July weekends it fills up — arrive before late morning for easy parking.

Two honest warnings. First, the water is Cascade snowmelt, and even in August it stays cold — refreshing on a 95-degree Upper County afternoon, bracing any other time. Second, there are no lifeguards anywhere on the lake, and the bottom drops away quickly in places once you’re off the beach shelf. Keep a close eye on kids, and consider life jackets for weaker swimmers.

Motorized boats, water skiing, kayaks, canoes, and paddleboards are all popular here — when the water cooperates. The main boat ramp is at Wish Poosh Campground, and here’s the catch every boater needs to know: the ramp is typically unusable by early-to-mid July as irrigation drawdown pulls the shoreline away from the concrete. The reliable motorized-boating window is roughly Memorial Day through the first week or two of July.

Paddlers get more flexibility — you can carry a kayak or paddleboard to the water long after the ramp closes, though the walk across exposed lakebed gets longer as summer wears on. Mornings are your friend: afternoon winds funnel up the valley with regularity, and the lake can go from glass to whitecaps quickly. Cold water plus wind is the combination that catches paddlers out, so wear that PFD.

Cle Elum Lake is open to fishing year-round, and the species list is long: kokanee, rainbow trout, westslope cutthroat, brook and brown trout, mountain whitefish, burbot, and lake trout that can top 20 pounds. Trolling is the standard approach for kokanee; deep trolling and jigging produce the big lake trout.

A few regulation highlights worth knowing (always confirm current rules with WDFW before you go): kokanee and sockeye must measure 9 to 15 inches to keep, two-pole fishing is permitted with the endorsement, and — unusually — anglers are encouraged to harvest every lake trout they catch. That’s because lake trout prey on juvenile sockeye, and the lake is the centerpiece of a major sockeye restoration effort (more on that below). Shoreline access is good along the Forest Service east shore, and WDFW maintains the Robert & Anna Bell water access area off SR 903.

For fly water, the Cle Elum River above and below the lake is its own destination — covered in our complete guide to fishing near Suncadia & Cle Elum.

If Wish Poosh is full, keep driving north on Salmon La Sac Road: Cle Elum River Campground, Red Mountain Campground (small and primitive), and the larger Salmon La Sac Campground all sit along the river above the lake, and together they form one of the best camping corridors in the Central Cascades.

Cle Elum Lake was a lake long before it was a reservoir — a natural glacial lake of roughly 3,000 acres carved into the valley. Between 1931 and 1933, the Bureau of Reclamation built the 165-foot earthfill Cle Elum Dam as part of the Yakima Project, enlarging the lake by roughly 60 percent and creating storage for about 437,000 acre-feet of irrigation water that still feeds the farms of the Yakima Valley. That’s why the lake drops so far each fall: the water you swam in come July is irrigating hops, apples, and hay by September.

The dams also cut off one of the region’s great sockeye salmon runs — for over a century, no sockeye spawned above the lake. That’s changing. Since 2009, Yakama Nation Fisheries has trucked returning adult sockeye from Priest Rapids Dam on the Columbia up to Cle Elum Lake, and Reclamation has invested in fish passage facilities at the dam. The result: the first sockeye spawning in the upper Cle Elum River in more than 100 years, with annual returns now measured in the thousands. It’s one of the most hopeful salmon-recovery stories in the state, happening quietly in Upper Kittitas County.

• Late May–early July: prime time. Full pool, boat launch open, campgrounds running, long days. This is the postcard version of Cle Elum Lake — plan boating trips in this window.
• Mid-July–August: swim and paddle season. Warmest weather, busiest beaches. The launch has usually closed, but Speelyi Beach and hand-carried craft are at their best.
• September–October: quiet and low. Drawdown exposes wide gravel shorelines and old stumps — striking in its own way, and the fall colors up-valley are excellent. Fishing continues; camping winds down mid-September.
• Winter: gateway season. The lake sits low and part-frozen while Salmon La Sac Road becomes a snowmobile and Nordic corridor via the area’s sno-parks. Check pass and road conditions before heading up. Our Suncadia in Winter guide covers the full season.

Cle Elum Lake rewards a little planning: hit it in early summer for the full-pool experience, bring layers and a PFD for the water, and stay for a river-valley sunset. It’s the Upper County’s biggest backyard — and it’s twenty minutes from your door.