Mission Creek’s Drawbridges: Why a Street Crossing Still Needs Machinery
By Matthew Martinez, Founder, CEO & Managing Broker, Diamond Real Estate Group. California DRE #01869679.
A street bridge usually appears to be a fixed piece of road. At Mission Creek, two crossings have another obligation: their decks can move to allow navigation through the channel.
The Lefty O’Doul Bridge at Third Street and Peter Maloney Bridge at Fourth Street connect the changing Mission Bay waterfront with older parts of the city. Their machinery preserves evidence of the channel’s working maritime past.
The crossings belong to different construction periods
San Francisco Public Works’ July 2023 account of its drawbridges identifies Fourth Street as the oldest of the three drawbridges the department operates. It opened in 1917; the Third Street crossing followed during the Great Depression.
The department’s Third Street rehabilitation history gives the Lefty O’Doul Bridge’s opening date as May 12, 1933, and associates its design with Joseph Strauss.
These are separate structures, not two names for the same bridge. The distinction is useful when reading a maintenance notice or comparing a route through the neighborhood.
A movable bridge contains several connected systems
The city’s waterfront transportation assessment distinguishes structural components such as piles and trusses from the counterweights, motors and electrical equipment that allow a drawbridge to open.
That makes the maintenance problem different from resurfacing a fixed road. The structure carries traffic when closed, while mechanical and electrical systems govern the opening movement. Both tasks must remain coordinated.
A counterweight helps balance the moving leaf, but it is part of an assembly that also includes pivots, supports and operating machinery. Its prominent position is a visible clue to work occurring throughout the bridge.
The Third Street project addressed more than paint
Public Works describes repairs to damaged steel, welds, concrete counterweights, support piles and bridge fenders, alongside rust removal and replacement of the steel deck. The work required divers and water-based equipment as well as crews above the channel.
The project separated counterweight work in late 2017 and early 2018 from a later phase extending through April 2020. During the second phase, the bridge remained down and available for crossing.
This sequence illustrates how the same structure can have different operating states during construction. A bridge may remain useful to street traffic while temporarily unable to perform its navigation function.
The channel’s traffic changed over time
The transportation assessment describes cargo activity along Mission Creek, including banana handling on its north bank, followed by a later emphasis on recreational boats and houseboats. The waterway retained its navigable designation even as its economic role changed.
The bridges consequently connect present streets while carrying obligations inherited from a different waterfront. Their continuing operation is a small but revealing link between the current neighborhood and its industrial history.
The waterfront is a network of land and water routes
A map emphasizing streets can make the creek look like an interruption. From the maritime perspective, the water is also a route, and the drawbridge is the device that lets those two networks share a crossing.
This is why a local connection can be technically complex despite its short distance. The bridge must serve users moving in different directions and on different levels.
Explore our Mission Bay guide, South Beach guide, and real estate and home for sale in San Francisco. Contact Diamond to connect waterfront character with the homes and actual local routes you are comparing.
Sources checked October 28, 2026. Historical rehabilitation arrangements do not establish current openings, closures or navigation schedules.
