Rimrock Lake is a 2,790-acre reservoir located in Yakima County, Washington, approximately 40 miles west of Yakima along Highway 12 in the Wenatchee National Forest. Formed by Tieton Dam on the Tieton River, this high-elevation reservoir (2,922 feet at the spillway) offers paddlers a scenic alpine setting surrounded by rugged mountain terrain and dense coniferous forests.

The lake stretches for approximately 6 miles along Highway 12, providing multiple access points for paddlers. Popular launch sites include Indian Creek Campground (Mile 177.1), Windy Point Campground (Mile 177.3), and several primitive camping areas along the north shore. Horseshoe Cove is particularly favored by beginners for its protected waters and proximity to nearby islands that make excellent paddling destinations.

Paddlers will find the lake generally suitable for all skill levels, with calm waters ideal for kayaking, canoeing, and stand-up paddleboarding. The warm summer water temperatures—warmer than most Washington waterways due to the lake's sun exposure—make swimming and water activities comfortable during peak season. The scenery is spectacular, featuring views of the Cascade Mountains, basalt canyon walls with columnar formations, and lush vegetation along the shoreline including oaks, poplars, ponderosa pines, and Douglas firs.

However, paddlers should exercise caution regarding wind conditions. The lake is known for sudden wind shifts, particularly in the afternoon, that can quickly transform calm waters into whitecaps. Mornings typically offer the most favorable paddling conditions. The lake also experiences significant water level fluctuations, especially during September when dam releases occur for downstream irrigation and salmon spawning purposes.

Wildlife viewing opportunities include native birds, mountain goats in surrounding terrain, and various fish species. The lake supports rainbow trout and kokanee populations, making it a popular fishing destination. Several public and private campgrounds along the shore, including Silver Beach Resort, provide convenient multi-day paddling basecamp options with boat launches and amenities.