Jamison Square is a city park in the area of downtown Portland, Oregon, known as the Pearl District. It was the first park added to the neighborhood.
At a cost of $3.6 million, the park was designed and built during the 12-year tenure of Mayor Vera Katz.
The park was designed by Peter Walker, Homer Williams and Partners Landscape Architecture. The park was initially designed as an outdoor art gallery, with square rocks and steps at the center, but no water. Water, running at random times over the rock, was added to keep skateboarding teenagers from using them. The water on the rocks ended up turning the park into an urban beach, attracting children and families who use it as a wading pool, with the intermittent nature making it a "manmade tidal pool", also called "the community pond" by locals.