US Bridges

State Route 1 over Kobbe Ave Hitchcock ST

Fair

San Francisco County, California · 04-SF-001-6.67-SF · Structure no. 34 0017

Built
1939
86 years old
Condition
Fair
inspected December 2023
Type
Tee Beam
Concrete Continuous
Length
708 ft
14 main spans
Daily traffic
64,000
2019 count
Owner
State
State Highway Agency

About this bridge

State Route 1 over Kobbe Ave Hitchcock ST is a concrete continuous tee beam carrying State Route 1 over Kobbe Ave Hitchcock ST in San Francisco County, California. It was built in 1939, so it is 86 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 64,000 vehicles a day, roughly 2% of them trucks, projected to reach 88,436 by 2041. The structure is 708 ft (215.8 m) long and 51 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesState Route 1
CrossesKobbe Ave Hitchcock ST
Location04-SF-001-6.67-SF
RouteState Highway 1
CountySan Francisco County
StateCalifornia
Coordinates37.79733, -122.4694
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionDecember 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 rating33.2 US tons
Inventory rating25.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans14
Design loadH 15
Structure length708 ft (215.8 m)
Longest span55 ft (16.8 m)
Deck width51 ft (15.4 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic64,000 (2019)
Projected traffic88,436 by 2041
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 1 over Kobbe Ave Hitchcock ST built?

It was built in 1939, making it 86 years old in 2025.

What condition is State Route 1 over Kobbe Ave Hitchcock ST 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 December 2023.

How much traffic does State Route 1 over Kobbe Ave Hitchcock ST carry?

About 64,000 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is State Route 1 over Kobbe Ave Hitchcock ST?

The structure is 708 ft (215.8 m) long with a longest span of 55 ft (16.8 m) and a deck 51 ft wide.

Who owns State Route 1 over Kobbe Ave Hitchcock ST?

It is owned by the State Highway Agency.