The Plunge, Swimming center in Point Richmond Historic District, California.

The Plunge is a two-story masonry natatorium in Point Richmond, Richmond, California, with an indoor warm-water pool twice the size of an Olympic pool, a fountain, observation balconies and an open truss ceiling reminiscent of San Francisco's Sutro Baths. The building has more than 170 windows, 132 of which can open and close.

The Plunge was built in 1926 through a municipal bond issue as a two-story natatorium with a warm-water pool twice Olympic size, a fountain, observation balconies and an open truss ceiling modelled on San Francisco's Sutro Baths. Its hollow-clay-tile walls cracked after 76 years of deferred maintenance, and the 1989 Loma Prieta earthquake caused further damage. The city closed it in August 2001 for seismic retrofitting; it reopened in August 2010.

The Plunge takes its name from the pool itself, and the building's open truss ceiling was modeled on San Francisco's Sutro Baths. Residents fought to save it from demolition, and the Richmond Friends of Recreation raised over $154,000 in cash plus more than $40,000 in in-kind donations for its restoration.

The Plunge is reached from Interstate 580 and by AC Transit line 72M Macdonald. The building sits in the Point Richmond Historic District, so renovation work had to respect its historic status. The pool reopened in August 2010 after seismic retrofitting and runs on a regular schedule again.

The Plunge sits inside the Point Richmond Historic District, listed on the National Register of Historic Places, so its 2008–2010 retrofit had to avoid damaging the site's historic value. Architect Todd Jersey donated hundreds of hours and raised part of the roof to add windows; the building has more than 170 windows, 132 of which open and close.