US Bridges

State Route 115 over Interstate 8

Good

Imperial County, California · 11-IMP-115-R3.30 · Structure no. 58 0222

Built
1971
54 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
226 ft
2 main spans
Daily traffic
1,450
2018 count
Owner
State
State Highway Agency

About this bridge

State Route 115 over Interstate 8 is a prestressed concrete continuous box beam or girders - multiple carrying State Route 115 over Interstate 8 in Imperial County, California. It was built in 1971, so it is 54 years old, younger 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 1,450 vehicles a day, roughly 40% of them trucks, projected to reach 2,096 by 2041. The structure is 226 ft (68.9 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesState Route 115
CrossesInterstate 8
Location11-IMP-115-R3.30
RouteState Highway 115
Coordinates32.77298, -115.28562
Functional classRural Major Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.3 US tons
Inventory rating42.9 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length226 ft (68.9 m)
Longest span115 ft (35.2 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,450 (2018)
Projected traffic2,096 by 2041
Trucks40%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 State Route 115 over Interstate 8 built?

It was built in 1971, making it 54 years old in 2025.

What condition is State Route 115 over Interstate 8 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 October 2024.

How much traffic does State Route 115 over Interstate 8 carry?

About 1,450 vehicles per day (2018 count), of which roughly 40% are trucks.

How long is State Route 115 over Interstate 8?

The structure is 226 ft (68.9 m) long with a longest span of 115 ft (35.2 m) and a deck 42 ft wide.

Who owns State Route 115 over Interstate 8?

It is owned by the State Highway Agency.