US Bridges

12th Ave over State Route 99

Fair

Sacramento County, California · 03-SAC-099-23.13-SAC · Structure no. 24 0161

Built
1959
66 years old
Condition
Fair
inspected February 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
213 ft
4 main spans
Daily traffic
21,000
2019 count
Owner
State
State Highway Agency

About this bridge

12th Ave over State Route 99 is a concrete continuous box beam or girders - multiple carrying 12th Ave over State Route 99 in Sacramento County, California. It was built in 1959, so it is 66 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 6 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 21,000 vehicles a day, roughly 2% of them trucks, projected to reach 27,625 by 2042. The structure is 213 ft (65 m) long and 63 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries12th Ave
CrossesState Route 99
Location03-SAC-099-23.13-SAC
RouteCity Street 0
CountySacramento County
StateCalifornia
Coordinates38.54114, -121.47419
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment7: Better than present minimum criteria
Operating rating46.7 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length213 ft (65 m)
Longest span73 ft (22.3 m)
Deck width63 ft (19.1 m)
Roadway width53 ft (16.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,000 (2019)
Projected traffic27,625 by 2042
Trucks2%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 12th Ave over State Route 99 built?

It was built in 1959, making it 66 years old in 2025.

What condition is 12th Ave over State Route 99 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 February 2024.

How much traffic does 12th Ave over State Route 99 carry?

About 21,000 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is 12th Ave over State Route 99?

The structure is 213 ft (65 m) long with a longest span of 73 ft (22.3 m) and a deck 63 ft wide.

Who owns 12th Ave over State Route 99?

It is owned by the State Highway Agency.