Olsen Lake is 13 hectares with a maximum depth of 6.6 meters and a mean depth of 3.7 meters. Brook trout are the targetable fish species present. Olsen Lake was stocked regularly with trout in 90s and 2000s but fell off the stocking list as access continued to get worse. Today, Olsen is primary angled in the winter months and brook trout plantings have shown some good success. The most recent plantings include 2018 and 2020.
**Due to the nature of difficulty regarding access on backcountry lakes, launch access areas are restricted to small watercraft only.
Located 50.8 km from Swan River, MB off PR #365 in the Porcupine Provincial Forest. The distance from trailhead to Olsen Lake is 7 km. The lake is located along an old logging road and is most commonly accessed snowmobile in the winter months. It is not recommended to hike this trail in the summer because of length and damage created by ATVs, however, is still possible. Because of possible logging operations, be sure to contact the nearest government office for updated information before using this trail. This trail is not maintained, and therefore fallen trees may complicate passage.