San Juan County

Roche Harbor, WA

Molt Search Report

User Submitted Data

Observation Type: Timed survey

Molts/crabs found: Yes

Also submitting Dungeness crab molt data: Yes

Number of Dungeness crab molts found: 17

Sex of Dungeness crab #1: No abdomen present

Carapace width of Dungeness crab #1: 142

Sex of Dungeness crab #2: No abdomen present

Carapace width of Dungeness crab #2: 60

Sex of Dungeness crab #3: No abdomen present

Carapace width of Dungeness crab #3: 140

Sex of Dungeness crab #4: No abdomen present

Carapace width of Dungeness crab #4: 115

Sex of Dungeness crab #5: No abdomen present

Carapace width of Dungeness crab #5: 145

Sex of Dungeness crab #6: Female

Carapace width of Dungeness crab #6: 50

Sex of Dungeness crab #7: No abdomen present

Carapace width of Dungeness crab #7: 161

Sex of Dungeness crab #8: No abdomen present

Carapace width of Dungeness crab #8: 174

Sex of Dungeness crab #9: No abdomen present

Carapace width of Dungeness crab #9: 134

Sex of Dungeness crab #10: No abdomen present

Carapace width of Dungeness crab #10: 147

Tidal Overview

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Weather Overview

Wind Speed: 1.1 MPH

Wind Direction: SSW (200°)

Temperature: 65℉

Rainfall (Calendar Day): 0"

Rainfall (Past 24 Hours): 0"

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1 Comment. Leave new

  • Lisa Watkins, Washington Sea Grant
    September 1, 2026 2:06 pm

    Hi Laura, As you’ve done is exactly right. You’re always welcome to add any additional measurements into the comments, but we only need measurements from up to 10 randomly selected Dungeness (and/or European green crabs) for a sufficient snapshot of the size range you’re seeing at that site that day. As much as you can get photos from directly overhead the better, since we’re likely to be able to pull additional measurements from photos someday as we need them, thanks to everyone remembering to put something it it for scale, as you have. Thanks for taking the time to search on San Juan! Green crabs were recently detected (again) in Westcott Bay, so it’s a timely spot to keep an eye on!

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