======= Siltcoos Lake ======= GPS Location 43.884714,-124.113796 [[https://umap.openstreetmap.de/en/map/coots-map_138835#12#12/43.884714/-124.113796|43.884714,-124.113796]] **Description** Siltcoos Lake (silt’-koos),[3] at 3,164 acres (1,280 ha), is the largest lake on the Oregon Coast. It's relatively shallow as the average depth is 11 foot.