MSF Documented Swim

Cathy Delneo

Round Trip Angel Island

10 miles (16 km)

30 August 2013

6 hours, 10 minutes

Observed & Documented by Evan Morrison

First woman to complete RT Angel Island



  • Name: Cathy Delneo
  • Age on swim date: 37
  • Nationality: United States
  • Resides: San Francisco, California, USA

Support Personnel

  • Paul Saab - pilot of SERC inflatable Big Red
  • Evan Morrison - crew / documenter

Swim Parameters

Category: Solo, nonstop, unassisted.

Rules: Equivalent to standard MSF Rules for unassisted swims (though MSF Rules did not yet exist in 2013).

Route Definition

Start @ SERC/Dolphin beach in Aquatic Park, exit through Aquatic Park opening, to west Angel Island, clockwise around Angel Island, return to SERC/Dolphin beach via Aquatic Park opening.

  • Route Distance: 10.0 statute miles (16.1 km)
  • Route Type: island loop
  • Start & Finish Location: Beach between South End Rowing Club and Dolphin Club docks, Aquatic Park, San Francisco (37°48’29.3”N 122°25’17.1”W)


Route pioneered by Rick Barthels in 1995 and subsequently repeated by Tom Linthicum, Mike Tzortzis, and Henrik Meerman. Cathy is the first woman to complete the swim.

Full list

Swim Data

  • Start: August 30, 2013, 04:10am.
  • Finish: August 30, 2013, 10:20am.
  • Elapsed: 6 hours, 10 minutes

Summary of Conditions

Feature Min Max
Water Temp 17C 17C
Air Temp 15C 18C
Wind calm 10 knots

GPS Track

Trackpoint frequency: 5 minutes. Download raw data (CSV).

Speed Plot

Observer Log

NYC Swim log used, as this was a qualifying swim for the 2014 Manhattan Island Marathon Swim.

Download PDF


Cathy Delneo - Round-Trip Angel Island from MSF on Vimeo.


Station FTPC1 - Fort Point, San Francisco, CA

Wind Speed

Water Temperature

Air Temperature