Tenmile Lake (Oregon) facts for kids

Quick facts for kids Tenmile Lake
Grasses and water lilies at Tenmile Lake
Tenmile Lake Location in Oregon Show map of Oregon Tenmile Lake Location in the United States Show map of the United States
Location	Lakeside, Coos County, Oregon
Coordinates	43°33′21″N 124°08′30″W / 43.55583°N 124.14167°W / 43.55583; -124.14167
Type	Natural, eutrophic
Primary inflows	North Tenmile Lake; Shutter, Adams, Johnson, Benson creeks
Primary outflows	Tenmile Creek
Catchment area	70 square miles (180 km2)
Basin countries	United States
Surface area	1,627 acres (658 ha)
Average depth	10 feet (3.0 m)
Max. depth	22 feet (6.7 m)
Water volume	16,200 acre-feet (20,000,000 m3)
Residence time	1 month
Shore length1	23 miles (37 km)
Surface elevation	13 feet (4.0 m)
Settlements	Reedsport, Lakeside
1 Shore length is not a well-defined measure.

Tenmile Lake is the largest and southernmost of a chain of lakes along the Oregon Coast south of the Umpqua River in the United States. The chain includes North Tenmile, Eel, Clear, and smaller lakes, which drain into the Pacific Ocean via Tenmile Creek. The lake is 8 miles (13 km) south of Reedsport and 0.5 miles (0.80 km) east of U.S. Route 101 near the community of Lakeside.

Tenmile Lake is named after the creek, which is about 10 miles (16 km) south of Winchester Bay. This community, at the mouth of the Umpqua River, was the earliest pioneer village along this part of the coast. Although the lake's official name is Tenmile Lake, it was formerly called Johnson Lake and South Tenmile Lake.

Geology and history

The lakes in the Tenmile Creek watershed formed after rising sea levels, driven by post-glacial warming, inundated the lower reaches of the creek and its tributaries. Sand dunes that later formed along the coast altered the region's drainage patterns and led to a string of lakes at varied elevations within the Tenmile basin.

In the early 20th century, Tenmile Lake was a cold-water fishery that supported large populations of coastal cutthroat trout, salmon, and the sea-run steelhead. However, the watershed was gradually altered by logging, farming, stream channeling, and the introduction of invasive fish species such as yellow perch and brown bullhead. Attempts to restore the cold-water fishery, including poisoning Eel, Tenmile and North Tenmile lakes with rotenone in 1968, all failed. Bluegill and largemouth bass are among species that have since dominated the fishery.

Recreation

Tenmile Lake and North Tenmile Lake combined have been called "a premier largemouth bass fishery." In addition to largemouth bass, the shallow dendritic lakes with their complicated shorelines support populations of brown bullhead, bluegill, black crappie, coastal cutthroat trout, and stocked rainbow trout. Bass-catching tournaments are common at these lakes, and experts are able to catch 20 to 50 largemouth a day that weigh 2 to 5 pounds (0.9 to 2.3 kg).

The two lakes, connected by the North Lake Canal, are used for boating, waterskiing, and swimming, as well as fishing. In Lakeside, near the outlet of Tenmile Lake, Coos County manages Tenmile Lakes Park. It has boat ramps, docks, a fish-cleaning stand, picnic tables, horseshoe courts, restrooms, and other amenities. A campground in the park accommodates recreational vehicles (RVs) and tents.