US Bridges

State Route 111 over Alamo River

Good

Imperial County, California · 11-IMP-111-29.51 · Structure no. 58 0142

Built
1971
54 years old
Condition
Good
inspected October 2024
Type
Slab
Concrete Continuous
Length
130 ft
4 main spans
Daily traffic
6,600
2018 count
Owner
State
State Highway Agency

About this bridge

State Route 111 over Alamo River is a concrete continuous slab carrying State Route 111 over Alamo River 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 6,600 vehicles a day, roughly 22% of them trucks, projected to reach 19,383 by 2041. The structure is 130 ft (39.6 m) long and 42 ft wide.

CarriesState Route 111
CrossesAlamo River
Location11-IMP-111-29.51
RouteState Highway 111
Coordinates33.084, -115.52039
Functional classRural Minor 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 inspectionOctober 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
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 rating78.9 US tons
Inventory rating47.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length130 ft (39.6 m)
Longest span32 ft (9.8 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,600 (2018)
Projected traffic19,383 by 2041
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 111 over Alamo River built?

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

What condition is State Route 111 over Alamo River 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 111 over Alamo River carry?

About 6,600 vehicles per day (2018 count), of which roughly 22% are trucks.

How long is State Route 111 over Alamo River?

The structure is 130 ft (39.6 m) long with a longest span of 32 ft (9.8 m) and a deck 42 ft wide.

Who owns State Route 111 over Alamo River?

It is owned by the State Highway Agency.