US Bridges

J ST-N51 on Ramp over N51-H ST Off Ramp & H ST

Good

Sacramento County, California · 03-SAC-051-1.15-SAC · Structure no. 24 0189S

Built
1966
59 years old
Condition
Good
inspected November 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
411 ft
4 main spans
Daily traffic
15,000
2010 count
Owner
State
State Highway Agency

About this bridge

J ST-N51 on Ramp over N51-H ST Off Ramp & H ST is a concrete continuous box beam or girders - multiple carrying J ST-N51 on Ramp over N51-H ST Off Ramp & H ST 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 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 15,000 vehicles a day, roughly 6% of them trucks, projected to reach 22,577 by 2045. The structure is 411 ft (125.3 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesJ ST-N51 on Ramp
CrossesN51-H ST Off Ramp & H ST
Location03-SAC-051-1.15-SAC
RouteState Highway 51
CountySacramento County
StateCalifornia
Coordinates38.57448, -121.46616
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Last inspectionNovember 2023
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 alignment8: Equal to present desirable criteria
Operating rating78.6 US tons
Inventory rating47.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length411 ft (125.3 m)
Longest span111 ft (33.8 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,000 (2010)
Projected traffic22,577 by 2045
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 J ST-N51 on Ramp over N51-H ST Off Ramp & H ST built?

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

What condition is J ST-N51 on Ramp over N51-H ST Off Ramp & H ST 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 2023.

How much traffic does J ST-N51 on Ramp over N51-H ST Off Ramp & H ST carry?

About 15,000 vehicles per day (2010 count), of which roughly 6% are trucks.

How long is J ST-N51 on Ramp over N51-H ST Off Ramp & H ST?

The structure is 411 ft (125.3 m) long with a longest span of 111 ft (33.8 m) and a deck 30 ft wide.

Who owns J ST-N51 on Ramp over N51-H ST Off Ramp & H ST?

It is owned by the State Highway Agency.