This detail from Marine Chart 18423 covers the area immediately west of Deception Pass.
North is left. Depths are in fathoms and feet.
From the Bowman Bay boat ramp it's about a nautical mile to Northwest Island, Deception Island, or Canoe and Deception Passes.
On the chart, the average maximum currents through Deception Pass are shown as 5.2 knots during the flood and 6.6 knots for the ebb. From a current table, the range of maximum daily currents through the pass runs from a 3 knot flood to an 8 knot ebb.
A fast current also develops through Canoe Pass and a significant current can develop through Northwest Pass, creating a rip off Lighthouse Point.