US Bridges

Iris Road over Drainage Channel

Fair

Riverside County, California · Approximately 500 Feet We · Structure no. AFCAPDPG6603B

Built
1940
85 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete Continuous
Length
29 ft
3 main spans
Daily traffic
3,000
2015 count
Owner
Federal
Air Force

About this bridge

Iris Road over Drainage Channel is a concrete continuous slab carrying Iris Road over Drainage Channel in Riverside County, California. It was built in 1940, so it is 85 years old, older 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 3,000 vehicles a day, projected to reach 3,600 by 2035. The structure is 29 ft (8.7 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesIris Road
CrossesDrainage Channel
LocationApproximately 500 Feet We
RouteFederal Lands Road 0
CountyRiverside County
StateCalifornia
Coordinates33.88818, -117.2459
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating34 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length29 ft (8.7 m)
Longest span8 ft (2.5 m)
Deck width28 ft (8.5 m)
Roadway width25 ft (7.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2015)
Projected traffic3,600 by 2035
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerAir Force
Maintained byAir Force
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Iris Road over Drainage Channel built?

It was built in 1940, making it 85 years old in 2025.

What condition is Iris Road over Drainage Channel 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 August 2023.

How much traffic does Iris Road over Drainage Channel carry?

About 3,000 vehicles per day (2015 count).

How long is Iris Road over Drainage Channel?

The structure is 29 ft (8.7 m) long with a longest span of 8 ft (2.5 m) and a deck 28 ft wide.

Who owns Iris Road over Drainage Channel?

It is owned by the Air Force.