US Bridges

State Route 185 over San Lorenzo Creek

Good

Alameda County, California · 04-ALA-185-1.61 · Structure no. 33 0114

Built
1960
65 years old, rebuilt 1974
Condition
Good
inspected November 2024
Type
Slab
Concrete
Length
42 ft
1 main span
Daily traffic
18,000
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 185 over San Lorenzo Creek is a concrete slab carrying State Route 185 over San Lorenzo Creek in Alameda County, California. It was built in 1960 and reconstructed in 1974, so it is 65 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 18,000 vehicles a day, roughly 3% of them trucks, projected to reach 44,632 by 2044. The structure is 42 ft (12.8 m) long and 273 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesState Route 185
CrossesSan Lorenzo Creek
Location04-ALA-185-1.61
RouteState Highway 185
Coordinates37.68581, -122.101
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.5 US tons
Inventory rating20.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length42 ft (12.8 m)
Longest span40 ft (12.2 m)
Deck width273 ft (83.2 m)
Roadway width85 ft (25.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,000 (2009)
Projected traffic44,632 by 2044
Trucks3%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 185 over San Lorenzo Creek built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1974.

What condition is State Route 185 over San Lorenzo Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2024.

How much traffic does State Route 185 over San Lorenzo Creek carry?

About 18,000 vehicles per day (2009 count), of which roughly 3% are trucks.

How long is State Route 185 over San Lorenzo Creek?

The structure is 42 ft (12.8 m) long with a longest span of 40 ft (12.2 m) and a deck 273 ft wide.

Who owns State Route 185 over San Lorenzo Creek?

It is owned by the State Highway Agency.