Diagonal St South Pacific Access
Diagonal St South Pacific Access is a public kayak and canoe launch on the Duwamish River near Seattle, Washington.
Washington Department of Fish and Wildlife has a report of New Zealand mudsnails in Duwamish River 4.5 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
- Carry-in (canoe and kayak)
- Car parking
- Yes (paved)
- Coordinates
- 47.56021, -122.34396
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
- Water level at the DUWAMISH R AT E MARGINAL WAY BR AT DUWAMISH, WA gauge · USGS, 4.9 mi away on Duwamish River
Water level
Latest reading loads here; without it, see the USGS page below.
USGS gauge DUWAMISH R AT E MARGINAL WAY BR AT DUWAMISH, WA, 4.9 mi from this launch on Duwamish River: water level, a reading every 15 minutes. Readings and history at USGS.
On the river
River mile 1.2 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: 11 ft below mean lower low water (MLLW); project depth 30 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
- Duwamish Public Access, Terminal 105 · 0.7 mi · Harbor Island Reach
- 1st Avenue South Bridge Boat Launch · 1.3 mi · Duwamish River
- Seacrest Park · 2.6 mi · Elliott Bay
- Lowman Beach Park · 2.9 mi · Puget Sound
- Don Armeni Boat Ramp · 2.9 mi · Elliott Bay
- Alki Beach Park · 3.0 mi · Elliott Bay
Sources
- Washington Ecology Shoreline Public Access sites with a boat launch (Puget Sound and the coast) record WS13680 · 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
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.