Tidal Trap Prevention Engine

Coastal Tide Cutoff Planner

Never get trapped by the rising ocean. Calculate headland pinch points, safe walking windows, return cutoffs, and emergency escape margins for isolated beaches.

1. Coastal Route & Tide Setup

Scenario Preset:

Location Name / Beach Target

Start Time (Walk Out) One-Way Walk Duration

Planned Time on Beach Safety Buffer Margin

2. Tidal Cycle & Pinch Point

Pinch-Point Clearance Elevation 4.2 ft

Water level above which the rocky headland point becomes impassable by foot.

Low Tide Extrema Feet (MLLW datum) Low Tide Peak Time Approximate Slack

High Tide Extrema Feet (MLLW datum) High Tide Peak Time Subsequent crest

Ocean Swell & Wave Runup Allowance Breaking swells surge higher than still-water astronomical tide tables.

Tidal Clearance Analysis

Simulated Window: 06:00 – 22:00

Safe Crossing Window

Pinch Cutoff Time

14:18

Headland flooded

Must-Leave Beach By

12:43

Includes 50m walk + buffer

Return Safety Margin

+45 min

Before water hits 4.2ft

Water At Pinch Now

1.4 ft

Passable dry sand

Tidal Elevation Curve & Pinch Impasse Zone Drag scrubber or click timeline to inspect any hour

Headland Pinch-Point Physical Cross-Section Passable dry route

Timeline Scrubber: 11:45 AM Outward Transit

Plan is viable with healthy margin. You begin outward trek at 09:30, reach the secluded cove by 10:20 during receding tide, and can enjoy 1.5 hours of beach time. You must turn back by 12:43 to cross the headland safely before rising waters cut off access at 14:18.

Tide analysis generated. Ready for export.

Why Coastal Stranding Happens So Fast

As documented in incidents like the Tillamook, Oregon cliff rescues, visitors frequently walk around rock headlands at low tide without realizing that incoming water doesn't rise at an even pace.

Under the Rule of Twelfths of tidal motion:

1st hour: Rises 1/12th of total range
2nd hour: Rises 2/12ths
3rd & 4th hours: Ocean surges at maximum velocity (3/12ths each hour)
5th & 6th hours: Slows down to 2/12ths and 1/12th

The midpoint of an incoming tide can submerge dry sand by several feet in just 45 minutes, trapping groups against sheer cliffs with no foot exit.

Driftwood SOS & Ocean Emergency Essentials

If you find yourself cut off by ocean tides before you can reach the exit trail:

Never attempt to swim through surge channels: Pacific rip currents and cold water gasping reflex kill within minutes.
Seek high ground immediately: Look for dry driftwood lines; green vegetation indicates elevations that daily high tides do not reach.
Signal visible air/sea help: As the stranded Tillamook party did, spell SOS with large driftwood visible to helicopters and USCG vessels.
Carry an offline tide table: Coastal cellular coverage drops around headlands; always export or screenshot your clearance window before departing the trailhead.