Little Crater Lake, Spring-fed lake in Mount Hood National Forest, Oregon, US.

Little Crater Lake is a spring-fed body of water in the Mount Hood National Forest, surrounded by dense evergreen forests. The water displays a deep blue color and reaches depths of about 45 feet.

Geologists first attributed the basin to a collapsed lava tube, citing the lake's steep, overhanging walls. Later interpretations favor a volcanic maar or block faulting. In all cases, artesian spring water fills the depression, and the lake takes its name from Crater Lake because of their shared blue color.

The lake's name comes from Crater Lake, also in Oregon, because both share blue water. The Pacific Crest National Scenic Trail passes nearby, and the site is reached by a short trail from a campground. Visitors often stop to see the lake's clear water and steep walls.

Nearby campgrounds provide tent and RV sites with basic facilities including tables and fire rings. The best time to visit is from late spring through early fall when roads are accessible.

The water is continuously replenished by an artesian spring system that maintains a remarkably steady temperature year-round. This constant cold water flow from underground sources keeps the lake cold even in summer months.