Oswego Lake

Reservoir in Oregon · 442 acres · near Lake Oswego

Oswego Lake has 1 carry-in launch listed as public.

Algal bloom precaution

Oregon Health Authority has a harmful algae precaution for this water (August 19, 2026). Precaution issued due to detection of cyanobacteria. Avoid contact with discoloured water or scum, and keep pets and children out of it.

Oregon Health Authority · checked October 18, 2026

Past algal blooms

Harmful algal blooms reported on this water (state reports compiled by U.S. EPA): 2025 and 2026.

state reports compiled by U.S. EPA · checked October 18, 2026

Boating rules

A person must not moor a boat more than 20 feet from shore and leave it unoccupied, except when secured to a dock. · all of Oswego Lake rule
A person must not operate a boat faster than 8 MPH in unrestricted areas during the time period ½ hour after sunset to ½ hour before sunrise; and 40 MPH in unrestricted areas during the time period ½ hour before sunrise to ½ hour after sunset · all of Oswego Lake rule
A person must operate the boat so that the boat and skier in tow remain 100 feet or more from shore, except when performing a safe take-off or landing. The red buoys placed at intervals around the lake shall be deemed to mark a distance of 100 feet from shore. Proceed in a counter clockwise pattern, which is west on the north side of the lake, and east on the south of the lake; keep as far distant as possible from adjoining docks, floats, and the shoreline. See full rules for towed watersports. · all of Oswego Lake rule
A person must not operate a paddleboard more than 100 feet from shore or under any bridge. · all of Oswego Lake rule
A person must not operate a motorboat at speeds excess of 6 MPH through channels, canals, and bridges; or within 100 feet of the shore, a swimmer, a canoe, or within areas marked by buoys · 6 zones on Oswego Lake rule
A person must not operate a motorboat for the purposes of towed watersports west of the buoy at the west end of Lakewood Bay · 1 zone on Oswego Lake rule
A person must not operate a motorboat for the purposes of towed watersports at the east end of the Main Lake between the buoy and the swim resort · 1 zone on Oswego Lake rule
A person must not operate a motorboat for the purposes of towed watersports south of the buoy at the entrance to, and within, Blue Heron Bay · 1 zone on Oswego Lake rule

From the boating rules map of Oregon State Marine Board (rules zones joined to our waters and launches; not endorsed by OSMB), read October 18, 2026. A map of rules is a guide: the regulation's text and the posted signs govern.

Launches

Millennium Park Paddle Access · Carry-in (canoe and kayak) · near Lake Oswego · free

Wikidata: Q7108236