US Bridges

State Route 51 NB over J K L Capitol N P Q S T

Fair

Sacramento County, California · 03-SAC-051-0.24-SAC · Structure no. 24 0188R

Built
1966
59 years old
Condition
Fair
inspected November 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
4,380 ft
42 main spans
Daily traffic
90,000
2015 count
Owner
State
State Highway Agency

About this bridge

State Route 51 NB over J K L Capitol N P Q S T is a concrete continuous box beam or girders - multiple carrying State Route 51 NB over J K L Capitol N P Q S T in Sacramento County, California. It was built in 1966, so it is 59 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 90,000 vehicles a day, roughly 6% of them trucks, projected to reach 103,217 by 2045. The structure is 4,380 ft (1,335 m) long and 69 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesState Route 51 NB
CrossesJ K L Capitol N P Q S T
Location03-SAC-051-0.24-SAC
RouteState Highway 51
Coordinates38.56214, -121.47183
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionNovember 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 geometry6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating55 US tons
Inventory rating33.2 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans42
Design loadHS 20
Structure length4,380 ft (1,335 m)
Longest span107 ft (32.6 m)
Deck width69 ft (20.9 m)
Roadway width67 ft (20.3 m)
Vertical clearance over deck18 ft (5.6 m)

Traffic and service

Average daily traffic90,000 (2015)
Projected traffic103,217 by 2045
Trucks6%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 51 NB over J K L Capitol N P Q S T built?

It was built in 1966, making it 59 years old in 2025.

What condition is State Route 51 NB over J K L Capitol N P Q S T 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 November 2023.

How much traffic does State Route 51 NB over J K L Capitol N P Q S T carry?

About 90,000 vehicles per day (2015 count), of which roughly 6% are trucks.

How long is State Route 51 NB over J K L Capitol N P Q S T?

The structure is 4,380 ft (1,335 m) long with a longest span of 107 ft (32.6 m) and a deck 69 ft wide.

Who owns State Route 51 NB over J K L Capitol N P Q S T?

It is owned by the State Highway Agency.