Union Reservoir West Campground
Campground · Yosemite corridor
Union Reservoir West Campground sits at 6,962 feet in the Yosemite corridor's high Sierra, a sheltered alpine water body with low crowds and modest wind exposure compared to exposed ridgeline camps.
Wind averages 6 mph but can gust to 20 mph in afternoon thermals off the lake. Morning stillness holds until 10 a.m., then strengthens through early afternoon before easing near sunset. Cold persists year-round; expect 35 degrees on average even in spring.
Over the past 30 days, Union Reservoir West averaged a NoGo Score of 17 with wind at 6 mph and temperature at 35 degrees Fahrenheit. Crowding runs light at 12 visitors on average, a rarity for the Yosemite corridor. The week ahead should track close to that baseline, with wind gusting toward 20 mph on warmer afternoons but calming mornings remaining the strongest window.
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About Union Reservoir West Campground
Union Reservoir West Campground occupies a protected cove on the reservoir's western shore, 6,962 feet up in California's high Sierra. Access is via Highway 120 from the west (Lee Vining direction) or from the eastern side via Highway 395. The camp sits roughly 30 minutes north of Mono Lake and operates as an overflow or quiet-preference site for visitors seeking to avoid the busier Yosemite Valley corridor and its traffic bottlenecks. The location offers a stable alpine base for water-based recreation, fishing, and high-country camping without the crowds or developed infrastructure of major national park facilities.
Weather at this elevation follows high-Sierra patterns: cold dominates even late spring, with 30-day average temperatures near 35 degrees Fahrenheit and extremes ranging from 23 to 51 degrees across the full year. Wind averages 6 mph but peaks at 20 mph during afternoon thermals, a pattern that strengthens as days warm and weakens after sunset. Crowding remains consistently light, averaging just 12 visitors, reflecting the site's low profile and limited amenities. Late snowpack can linger into early summer, and high-altitude sun exposure demands strong sunscreen year-round. The short growing season means vegetation around the camp stays sparse and low.
Union Reservoir West suits anglers, dispersed campers, and visitors prioritizing solitude over convenience. Experienced high-country campers plan morning launches for still-water paddling or fishing before the 10 a.m. wind onset; afternoon wind makes such activities harder but opens the site to those seeking alpine camping without premium crowds. Water is cold year-round and requires flotation gear; this location is not suitable for inexperienced swimmers or families with young children unwilling to wear PFDs. Parking fills only on holiday weekends; the typical visitor faces no pressure to arrive early.
Nearby Mono Lake, visible from some ridge vantage points, sits lower and warmer but draws significantly more traffic. Tioga Lake and Grant Lake offer similar high-altitude character with slightly better developed services. Visitors combining Union Reservoir West with a Yosemite pass often position here as a quiet staging base, avoiding Yosemite's entrance queues by exploring the eastern Sierra's geology, water features, and weather patterns on their own schedule.