Lost Lake Day Use Area

Facility · California ·

Managed by the USDA Forest Service

San Bernardino National Forest (NF) · Open Access

2,762 ft
Elevation

Lost Lake is a unique natural lake created by the San Andreas Fault and is fed by deep natural springs.

Although the lake has not been stocked with fish for many years, people still try their luck and toss a line in. Many visit the lake to picnic along the banks.

There are also opportunities for bird watching.

Getting there

Swarthout Canyon Road, west of Old Cajon Blvd in Cajon Pass.

34.27225, -117.46606 · 34°16'20.1"N 117°27'57.8"W

Directions (Google Maps) · Directions (Apple Maps)

Typical weather

JanFebMarAprMayJunJulAugSepOctNovDec
High °F————————————
Low °F————————————
Precip in5.05.43.51.10.60.10.10.10.20.81.33.4

1991–2020 averages from the nearest NOAA station, 8.5 mi away — not measured at the facility itself, and elevation can make a real difference over that distance.

Map

Member photos

Common questions about Lost Lake Day Use Area

Can you reserve a site at Lost Lake Day Use Area?
No. Lost Lake Day Use Area is not reservable through Recreation.gov, so sites are first-come, first-served or booked elsewhere.

Camping near Lost Lake Day Use Area

Comments

Contact

Recreation.gov last updated this record on 2026-02-25.

Facility information and photographs from Recreation.gov (RIDB). SpotOpened is not affiliated with Recreation.gov or any federal agency.