Siltcoos Lake
| Siltcoos Lake | |
|---|---|
View from Westlake Park | |
| Location | Near Pacific Ocean coast in Douglas and Lane counties, Oregon |
| Coordinates | 43°52′54″N 124°06′45″W / 43.88167°N 124.11250°W |
| Type | Natural, permanent, eutrophic |
| Primary inflows | Woahink, Fiddle, Maple, and Lane creeks |
| Primary outflows | Siltcoos River |
| Catchment area | 68 square miles (180 km2) |
| Basin countries | United States |
| Surface area | 3,164 acres (1,280 ha) |
| Average depth | 11 feet (3.4 m) |
| Max. depth | 22 feet (6.7 m) |
| Water volume | 33,900 acre-feet (41,800,000 m3) |
| Residence time | 2 months |
| Shore length1 | 28 miles (45 km) |
| Surface elevation | 13 feet (4.0 m) |
| Islands | Booth, Reed (Webber), Jernigan (Goat), Boy Scout, Butterfly, Grass, |
| Settlements | Dunes City, Westlake Siltcoos, Oregon |
| References | |
| 1 Shore length is not a well-defined measure. | |
Siltcoos Lake (silt’-koos), at 3,164 acres (1,280 ha), is the largest lake on the Oregon Coast of the United States. Fed by runoff from a basin of about 68 square miles (180 km2) in Douglas and Lane counties, it is about 7 miles (11 km) south of Florence and 0.5 miles (1 km) east of U.S. Route 101. Its name comes from a Lower Umpqua (Siuslaw) placename, a variant of which is Tsiltcoos.
The lake, with a mean elevation of 13 feet (4 m) above sea level, empties into the Siltcoos River, which meanders generally west for about 3 miles (4.8 km) to its mouth on the Pacific Ocean. A dam about a half-mile downriver regulates the lake's outflow.