1st Avenue South Bridge Boat Launch
1st Avenue South Bridge Boat Launch is a public boat ramp on the Duwamish River near Seattle, Washington.
- Tidal
Washington Department of Fish and Wildlife has a report of New Zealand mudsnails in Duwamish River 2.5 km from this launch. Clean, drain and dry your boat, trailer and gear before you leave, and do not move water, plants or live bait to another water.
Washington Department of Fish and Wildlife · checked October 20, 2026
Status not reported No closure has been posted for this launch, but its agency does not publish open or closed status. Check with the managing agency before you tow.
At the launch
- Type
- Boat ramp
- Car parking
- Roadside
- Tidal
- Yes
- Coordinates
- 47.54298, -122.33364
Channel depths in feet from the Army Corps' surveys (Seattle District; the one nearest this launch is of February 10, 2026). Not for navigation.
Boating rules
- No-discharge zone: WAC 173-228 bans vessel sewage discharges, whether treated or not, in the No Discharge Zone. It became effective May 10, 2018. · all of Duwamish River rule
From the boating rules map of Washington Department of Ecology, read October 20, 2026. A map of rules is a guide: the regulation's text and the posted signs govern.
Conditions
- Weather forecast for this launch · National Weather Service
- Tide predictions at Duwamish Waterway, Eighth Ave. South · NOAA, 0.7 mi away
Tides
Predicted highs and lows at NOAA's Duwamish Waterway, Eighth Ave. South station, 0.7 mi from this launch, in local time above MLLW. Predictions, not observations: wind and weather move the real tide. Full predictions at NOAA.
| Mon Nov 2 | Low 4:14 am 0.2 ft · High 12:05 pm 11.2 ft · Low 6:37 pm 5.7 ft · High 10:57 pm 7.8 ft |
|---|---|
| Tue Nov 3 | Low 5:23 am 1.2 ft · High 12:54 pm 11.2 ft · Low 7:33 pm 4.3 ft |
| Wed Nov 4 | High 12:40 am 7.9 ft · Low 6:32 am 2.3 ft · High 1:34 pm 11.3 ft · Low 8:17 pm 2.8 ft |
| Thu Nov 5 | High 2:07 am 8.4 ft · Low 7:37 am 3.2 ft · High 2:06 pm 11.3 ft · Low 8:54 pm 1.4 ft |
| Fri Nov 6 | High 3:17 am 9.2 ft · Low 8:35 am 4.2 ft · High 2:34 pm 11.2 ft · Low 9:27 pm 0.2 ft |
| Sat Nov 7 | High 4:15 am 10.0 ft · Low 9:28 am 5.1 ft · High 3:00 pm 11.1 ft · Low 9:57 pm -0.6 ft |
| Sun Nov 8 | High 5:06 am 10.6 ft · Low 10:17 am 5.9 ft · High 3:25 pm 10.8 ft · Low 10:27 pm -1.2 ft |
On the river
River mile 2.5 on Duwamish River · Washington Department of Ecology river miles (USGS and WDFW), placed between its mile markers
Sources: Washington Department of Ecology river miles (USGS and WDFW).
Channel survey
The Army Corps surveys the channels it maintains and posts every survey.
- Duwamish Waterway · 0.1 mi from this launch
Condition survey of February 10, 2026 by the Seattle District. Least depth in the channel: 0.6 ft below mean lower low water (MLLW); project depth 20 ft. Survey sheet (PDF)
US Army Corps of Engineers hydrographic surveys, from eHydro. A survey shows the bottom on the day it was made; channels shoal after high water and change with dredging. Not for navigation.
On Duwamish River
River in Washington. All launches on Duwamish River.
Community
Where people who use Duwamish River talk about it.
Nearby launches
- Diagonal St South Pacific Access · 1.3 mi · Duwamish River
- Duwamish Public Access, Terminal 105 · 2.0 mi · Harbor Island Reach
- Lincoln Park · 2.9 mi
- Lowman Beach Park · 3.0 mi · Puget Sound
- Stan Sayres Boat Ramp · 3.3 mi · Lake Washington
- Adams Street Boat Ramp · 3.5 mi · Lake Washington
Sources
- Washington Ecology Shoreline Public Access sites with a boat launch (Puget Sound and the coast) record WS01850 · Washington Department of Ecology, Category 1 public information; use of Ecology data with credit to Ecology and a link to the data page; commercial and political use prohibited
- OpenStreetMap w428098662 © OpenStreetMap contributors, ODbL
Why it is listed as public: listed by Washington Ecology Shoreline Public Access sites with a boat launch (Puget Sound and the coast). Something wrong, or is this launch private? Send a correction; it goes to a person.