US Bridges

Fort Irwin RD over Storm Drainage

Fair

San Bernardino County, California · 0.8 Mi. NE Cable RTE · Structure no. DAPFORNTC000004

Built
1983
42 years old
Condition
Fair
inspected April 2024
Type
Slab
Prestressed Concrete
Length
103 ft
2 main spans
Daily traffic
6,760
2008 count
Owner
Federal
Army

About this bridge

Fort Irwin RD over Storm Drainage is a prestressed concrete slab carrying Fort Irwin RD over Storm Drainage in San Bernardino County, California. It was built in 1983, so it is 42 years old, younger 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 6 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 6,760 vehicles a day, roughly 12% of them trucks, projected to reach 10,243 by 2046. The structure is 103 ft (31.4 m) long and 42 ft wide.

CarriesFort Irwin RD
CrossesStorm Drainage
Location0.8 Mi. NE Cable RTE
Coordinates35.16836, -116.761
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 rating49.6 US tons
Inventory rating32.8 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length103 ft (31.4 m)
Longest span50 ft (15.2 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,760 (2008)
Projected traffic10,243 by 2046
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerArmy
Maintained byArmy
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$2,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Fort Irwin RD over Storm Drainage built?

It was built in 1983, making it 42 years old in 2025.

What condition is Fort Irwin RD over Storm Drainage 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 April 2024.

How much traffic does Fort Irwin RD over Storm Drainage carry?

About 6,760 vehicles per day (2008 count), of which roughly 12% are trucks.

How long is Fort Irwin RD over Storm Drainage?

The structure is 103 ft (31.4 m) long with a longest span of 50 ft (15.2 m) and a deck 42 ft wide.

Who owns Fort Irwin RD over Storm Drainage?

It is owned by the Army.