The Thompson Seeps are located approximately 11.5 miles southwest of Othello, Washington in Franklin County. Thompson Seep South has a mean depth 6 feet and a maximum depth of 14 feet, and is approximately 25 acres in size. Lake is fed from groundwater and run-off flow from the Wahluke Branch Ten Wasteway.
South Thompson Seeps is owned by the United States Bureau of Reclamation but is managed by the Washington Department of Fish and Wildlife. Primitive roads, consisting mostly of sand and gravel, lead to the lake.
Thompson Seep South provides anglers two primitive boat launch areas, both located on the west shoreline.
Two-pole fishing is allowed
Shoreline access: Good - Limited shoreline access
Species you might catch
Lake information
County: Franklin
Acreage: 58.20 ac.
Elevation: 793 ft.
Center: 46.675362, -119.272949
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Fishing prospects calendar
Largemouth bass
Fishing improves throughout the spring as waters warm and fish move onshore, peaking during the spawn. Summer is a slight lull though dawn/dusk hours can be very good. Catch improves in Fall as waters cool, vegetation begins to die back, and prey becomes more available. Winter is the hardest time because fish are offshore and slow moving.
Yellow perch
Yellow Perch can be caught year-round. Fishing is best in the summer after they finish spawning in April-May. Fish can be readily angled through the summer from both the shore and boat. Catch begins to decline in the fall as water temperatures cool and fish move offshore forcing anglers to pursue them in boats. Successful fishing for Yellow Perch in the winter involves either targeting schools in deep water from boats or through the ice.
Black crappie
Fishing improves throughout the Spring, peaking during the spawn. Summer is a slight lull, while Fall sees an improvement as waters cool, vegetation dies back, and prey becomes more available. During winter, the bite is slower, but anglers can have great success fishing through the ice when conditions are safe.
Bluegill
Bluegill can be caught year-round, but fishing is best in the warm months of Summer. Fishing improves throughout the spring, peaking during the spawn in early-Summer. Fish move offshore into deeper waters through the fall as water temperatures cool making it more difficult to target them. Winter is the most difficult season in which to catch Bluegill, but persistent anglers can find them in schools of like-sized fish offshore.
Pumpkinseed Sunfish
Pumpkinseed Sunfish are ubiquitous in most lowland lakes and readily caught year-round. Fishing is best in the spring and summer, peaking during the spawn in June. Fish move offshore into deeper waters through the fall as water temperatures cool making it more difficult to target them. Winter is the most difficult season to catch Pumpkinseed, but persistent anglers can find nice-sized schools offshore.
Yellow bullhead
Fishing improves throughout the spring, peaking before the spawning period in May and June. Fishing may pick up in early Fall, followed by a decrease in action as waters cool. Winter is a difficult time to target this species.
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