Sierra Nevada's Hidden High-Country Lake
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Why Rent On Union Valley Reservoir
Union Valley Reservoir rests at 4,870 feet in the Crystal Basin of Eldorado National Forest, about 20 miles northeast of Placerville in the Sierra Nevada. Built in 1963 by the Sacramento Municipal Utility District, it is the largest body of water in the Crystal Basin — a forested stretch of the Sierra that sees a fraction of the crowds that reach Lake Tahoe 45 minutes to the north. Cold, clear water surrounded by pines and granite, easy trail access, and several well-maintained USFS campgrounds make this a compelling alternative for anyone who wants the Sierra experience without peak-season Tahoe pricing and traffic. The tradeoff is self-sufficiency: services near the water are limited, and the reservoir rewards visitors who arrive prepared.
On the water
Kokanee salmon trolling near the dam is the main fishing draw, with fish typically taken in 50 to 70 feet of water on pink hoochies or Apex lures. Largemouth bass, bluegill, and rainbow trout round out the catch. Motorized boating is permitted and boat ramps are managed through the Eldorado National Forest; non-motorized paddling, kayaking, and stand-up paddleboarding suit the reservoir’s generally calm morning conditions before afternoon winds develop. Swimming is permitted, though the water stays cold well into summer — fed largely by snowmelt at nearly 5,000 feet, surface temperatures typically peak in July and August in the low-to-mid 70s Fahrenheit. Depth increases quickly away from shore and no lifeguards patrol the reservoir; life jackets are advisable for younger children and less confident swimmers in all conditions. A California fishing licence is required; check current regulations at wildlife.ca.gov before fishing. Confirm current swimming advisories and fire restrictions through the Eldorado National Forest before you visit — restrictions can tighten with little notice during hot, dry stretches.
What to do near Union Valley Reservoir
The U.S. Forest Service manages several campgrounds and day-use areas around the reservoir, including Wench Creek, Yellowjacket, and West Point, each with direct lake access. The Van Vleck Bunkhouse, a historic ranch building on the shoreline, offers a glimpse of the area’s pre-dam past worth a short stop. Wrights Lake and the Desolation Wilderness, reachable by day hike from the surrounding trail network, extend the backcountry options considerably for those inclined to spend a day on foot. Pollock Pines, the closest town, covers gas, groceries, and basic services for resupply. The Sacramento Municipal Utility District adjusts reservoir levels based on power generation demand, and water levels can drop noticeably by late summer — check current SMUD conditions ahead of any boat-ramp-dependent visit, and confirm road conditions on Ice House Road after winter before you drive in.
When to go and where to stay
Late June through September is the primary season, with campsite reservations filling quickly for summer weekends — plan at least a month in advance. Camping at USFS sites around the reservoir is the most direct way to experience the water; if you prefer a roof and a real bed, vacation homes and cabins in Pollock Pines and Camino offer the Sierra mountain setting with kitchen space, comfortable bedrooms, and room for gear storage. The shoulder seasons of late May and early October deliver quieter conditions and the particular quality of the Sierra at the edges of summer. Browse Lake.com for pet-friendly rentals and properties that sleep larger groups near Union Valley Reservoir in the Pollock Pines and El Dorado County area.
- Surface area (mi)
- 7.33
- Max depth (ft)
- 359.91
- Elevation (ft)
- 4855.64
- Shoreline length (mi)
- 343.25
Popular activities
- Boating
- Kayaking
- Swimming
- Fishing
- Hiking
- Ice Skating
- Cross-country Skiing
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Frequently Asked Questions
Ready to dive into what Union Valley Reservoir has to offer? Let’s tackle some of the burning questions you might have as you plan your visit!
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Yes, swimming is allowed in Union Valley Reservoir. There is a swimming beach onsite, and swimming and paddleboarding are popular activities to cool off and enjoy the reservoir.
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Union Valley Reservoir is a popular destination because it offers a wide range of activities. It provides opportunities for boating, water skiing, swimming, and fishing for trout and salmon. The reservoir also has hiking and biking trails, including the 4.8-mile Union Valley Bike Trail and the Bassi Falls Hiking Trail.
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For Union Valley Reservoir in California, fishing regulations and bag limits are not explicitly stated, but anglers must check the Department of Fish and Wildlife website for current regulations due to fluctuating water levels. Ice fishing is not recommended, and artificial lures with barbless hooks may be required in some areas.
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The beach at Sunset Campground is best for families. It has a large sandy beach and easy access to the lake, making it ideal for swimming, kayaking, and paddleboarding. The campground also offers amenities like picnic tables, fire rings, and showers nearby.
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Union Valley Reservoir is near the towns of Pollock Pines, Camino, and Grizzly Flats. These towns are located in El Dorado County, California, with Pollock Pines being about 12.4 miles southwest of the reservoir.