PEIRCE ISLAND OUTDOOR POOL Peirce Island Pool Open June 23 - August 24, 2014 Phone: (603) 433-0039 * Email: outdoorpool@cityofportsmouth.com UPDATE: With a forecast for sunny and extremely warm weather, the Peirce Island Pool will extend its summer season through Friday, August 29th.  We will be open for all age swimmers, residents and non-residents, from 12 noon to 5:15 p.m., Monday-Friday.   Originally built in 1937 and fully refurbished in 2003, the Peirce Island Pool is the perfect place to spend a hot, sunny summer afternoon. With a length of 100 yards, a width of 33 yards and a gently sloping depth from 18 inches to six feet, it provides space for every age and ability.