The Geology and Geography of Cultus Lake
Cultus Lake lies in the Columbia Valley, approximately 10km's south of the town of Chilliwack, and 80km's southeast of Vancouver, British Columbia. It is fed from the south by Frosst Creek and several smaller tributaries along its shoreline and drains into the Chilliwack-Vedder river system to the north via Sweltzer Creek.
Far in the geologic past, several periods of glaciation (ice ages) covered the entire Fraser Valley and flooded the Columbia Valley floor with deposits of glacial till or sediment. Cultus Lake is thought to have formed in what is called a glacial "kettle" or hollow, left there by a melting ice sheet that pressed out the margins of the surrounding sediment. The eastern shore of the lake has three well defined post-glacial alluvial fans composed of andesite and shale, washed down by creeks from the slopes of the mountains above.
Source:http://www.env.gov.bc.ca/bcparks/planning/mgmtplns/cultus_lake/cultus_lake_mp_final.pdf
Cultus Lake lies in the Columbia Valley, approximately 10km's south of the town of Chilliwack, and 80km's southeast of Vancouver, British Columbia. It is fed from the south by Frosst Creek and several smaller tributaries along its shoreline and drains into the Chilliwack-Vedder river system to the north via Sweltzer Creek.
Far in the geologic past, several periods of glaciation (ice ages) covered the entire Fraser Valley and flooded the Columbia Valley floor with deposits of glacial till or sediment. Cultus Lake is thought to have formed in what is called a glacial "kettle" or hollow, left there by a melting ice sheet that pressed out the margins of the surrounding sediment. The eastern shore of the lake has three well defined post-glacial alluvial fans composed of andesite and shale, washed down by creeks from the slopes of the mountains above.
Source:http://www.env.gov.bc.ca/bcparks/planning/mgmtplns/cultus_lake/cultus_lake_mp_final.pdf