US Bridges

Treasure Island RD over Sidehill

Fair

San Francisco County, California · Jeo Shv #2/ Jwo Shv #6 · Structure no. 34C0079

Built
1964
61 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
246 ft
12 main spans
Daily traffic
1,000
2020 count
Owner
County
County Highway Agency

About this bridge

Treasure Island RD over Sidehill is a steel stringer/multi-beam or girder carrying Treasure Island RD over Sidehill in San Francisco County, California. It was built in 1964, so it is 61 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,000 vehicles a day, roughly 3% of them trucks, projected to reach 3,000 by 2040. The structure is 246 ft (75 m) long and 25 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesTreasure Island RD
CrossesSidehill
LocationJeo Shv #2/ Jwo Shv #6
RouteCity Street 0
CountySan Francisco County
StateCalifornia
Coordinates37.80903, -122.36872
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans12
Design loadUnknown
Structure length246 ft (75 m)
Longest span20 ft (6.1 m)
Deck width25 ft (7.5 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2020)
Projected traffic3,000 by 2040
Trucks3%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Treasure Island RD over Sidehill built?

It was built in 1964, making it 61 years old in 2025.

What condition is Treasure Island RD over Sidehill in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.

How much traffic does Treasure Island RD over Sidehill carry?

About 1,000 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is Treasure Island RD over Sidehill?

The structure is 246 ft (75 m) long with a longest span of 20 ft (6.1 m) and a deck 25 ft wide.

Who owns Treasure Island RD over Sidehill?

It is owned by the County Highway Agency.