US Bridges

State Route 98 over Alamo River

Good

Imperial County, California · 11-IMP-098-39.92 · Structure no. 58 0136

Built
1977
48 years old
Condition
Good
inspected October 2024
Type
Slab
Concrete Continuous
Length
196 ft
7 main spans
Daily traffic
2,800
2018 count
Owner
State
State Highway Agency

About this bridge

State Route 98 over Alamo River is a concrete continuous slab carrying State Route 98 over Alamo River in Imperial County, California. It was built in 1977, so it is 48 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 2,800 vehicles a day, roughly 40% of them trucks, projected to reach 8,684 by 2041. The structure is 196 ft (59.7 m) long and 43 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesState Route 98
CrossesAlamo River
Location11-IMP-098-39.92
RouteState Highway 98
Coordinates32.69374, -115.37414
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 protection8 Very GoodNo problems noted.
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.6 US tons
Inventory rating44.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length196 ft (59.7 m)
Longest span30 ft (9.1 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2018)
Projected traffic8,684 by 2041
Trucks40%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 98 over Alamo River built?

It was built in 1977, making it 48 years old in 2025.

What condition is State Route 98 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 98 over Alamo River carry?

About 2,800 vehicles per day (2018 count), of which roughly 40% are trucks.

How long is State Route 98 over Alamo River?

The structure is 196 ft (59.7 m) long with a longest span of 30 ft (9.1 m) and a deck 43 ft wide.

Who owns State Route 98 over Alamo River?

It is owned by the State Highway Agency.