Site Rating: Extreme Expert

Prerequisites

• Accompanied: Divers new to this site should be accompanied by a site expert.
• Mandatory: Significant prior current experience is required (not just high-current sites at slack).
• Pro Tip: Doing this as a boat dive first is highly recommended.

1) Logistics, Parking & Access

• Parking: North Parking Lot (Deception Pass State Park).
• Seasonal Closure: Lot is typically closed Oct-March. Call the ranger station to verify opening date (usually around March 1st).
• The Path: Take the established trail from the north lot down to the bridge.
• Warning: Do not scramble down Canoe Pass cliffs.

2) Surface Hazards (Boats & Fishing)

• Boat Traffic: During fishing season, this pass is a major thoroughfare. Expect heavy boat traffic in the channel.
• Shore Fishing: Be hyper-aware of fishing lines in the bay. Shore casting creates entanglement hazards in shallower zones.

3) Conditions & Slack Timing (Go / No-Go)

• Wind: Do not dive on windy days. Wind can make the water hard to read, and waves can grow as ebb moves against wind.
• Slack Prediction (the challenge):

• Data Sources: Consult both XTide and NOAA. Predictions can vary by up to 60 minutes.
• Reality Check: Actual slack is usually +/- 20 minutes from one of those predictions.
• Protocol: Arrive early and confirm visually. Do not gear up solely from charts. Be willing to go home or switch sites if waves build or someone is uncomfortable.

4) Dive Plan & Entry Strategies

Strategy A: "The Subtle Approach"

• Swim out along the wall to the end of the kelp once water has significantly slowed. Even when calm-looking, expect possible backeddy. Swimming slightly away from cliffs can reduce backeddy strength.
• Wait along the wall. Descend only after confirming water has significantly slowed. Be ready to resurface if conditions are wilder below.
• Note: With Approach A, avoid going much farther than the first small wall near the point. Going too far often hits upwelling.

Strategy B: "The Bypass Approach" (Advanced)

1. Wait for water to slow, then proceed on surface near the point.
2. Pass the point on surface only when conditions allow.
3. Staging: Once past point, wait in kelp on the surface before the bridge.
4. Move: When upwelling and standing waves have lessened significantly, float under bridge.
5. Critical Maneuver: As you pass the bridge support, do a quick swim back to the wall to escape upwelling.
6. Wait: Hold position along the wall until upwelling dissipates.
7. Trial Descents: Descend to ~15 ft to test conditions. If too turbulent, return to surface and wait.

5) Critical Hazards & Safety

• No Quick Exit: A rapid return to shore is not viable; once in the flow, you are committed.
• Vertical Currents: Powerful upwelling/downwelling occurs in consistent areas. Ask your experienced buddy to identify these spots.
• "Wave Pool" Effect: If waves pick up, stay away from cliffs. Turbulence is strongest against the wall.
• Back Eddy: A massive back eddy forms near the entrance as ebb increases. Do not overstay or you may be pushed away from exit.
• Gas Management: Reserve extra gas to fight potential back eddy.
• Differential Slack: Water under the bridge slacks at a different time than the bay.