US Bridges

Ager Road over Oregon Slough

Fair

Siskiyou County, California · 0.45 MI S Reservoir RD · Structure no. 02C0056

Built
1980
45 years old
Condition
Fair
inspected August 2024
Type
Slab
Concrete Continuous
Length
52 ft
2 main spans
Daily traffic
841
2020 count
Owner
County
County Highway Agency

About this bridge

Ager Road over Oregon Slough is a concrete continuous slab carrying Ager Road over Oregon Slough in Siskiyou County, California. It was built in 1980, so it is 45 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 5 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 841 vehicles a day, roughly 35% of them trucks, projected to reach 1,828 by 2041. The structure is 52 ft (16 m) long and 33 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesAger Road
CrossesOregon Slough
Location0.45 MI S Reservoir RD
RouteCounty Highway 0
CountySiskiyou County
StateCalifornia
Coordinates41.73504, -122.52454
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating35.4 US tons
Inventory rating27.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length52 ft (16 m)
Longest span25 ft (7.6 m)
Deck width33 ft (10 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic841 (2020)
Projected traffic1,828 by 2041
Trucks35%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Ager Road over Oregon Slough built?

It was built in 1980, making it 45 years old in 2025.

What condition is Ager Road over Oregon Slough 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 2024.

How much traffic does Ager Road over Oregon Slough carry?

About 841 vehicles per day (2020 count), of which roughly 35% are trucks.

How long is Ager Road over Oregon Slough?

The structure is 52 ft (16 m) long with a longest span of 25 ft (7.6 m) and a deck 33 ft wide.

Who owns Ager Road over Oregon Slough?

It is owned by the County Highway Agency.