US Bridges

Anderson RD over Irrigation Canal

Fair

Klamath County, Oregon · 031 MI E of HWY 39 · Structure no. 35C108098400310

Built
1981
44 years old
Condition
Fair
inspected February 2023
Type
Slab
Prestressed Concrete
Length
47 ft
1 main span
Daily traffic
329
2020 count
Owner
County
County Highway Agency

About this bridge

Anderson RD over Irrigation Canal is a prestressed concrete slab carrying Anderson RD over Irrigation Canal in Klamath County, Oregon. It was built in 1981, so it is 44 years old, younger than the Oregon average of 49.9 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 329 vehicles a day, roughly 10% of them trucks, projected to reach 359 by 2025. The structure is 47 ft (14.3 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesAnderson RD
CrossesIrrigation Canal
Location031 MI E of HWY 39
RouteCounty Highway C0984
CountyKlamath County
StateOregon
Coordinates42.03869, -121.56524
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 inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to 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 rating29.7 US tons
Inventory rating22.8 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length47 ft (14.3 m)
Longest span45 ft (13.7 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic329 (2020)
Projected traffic359 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Anderson RD over Irrigation Canal built?

It was built in 1981, making it 44 years old in 2025.

What condition is Anderson RD over Irrigation Canal 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 February 2023.

How much traffic does Anderson RD over Irrigation Canal carry?

About 329 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Anderson RD over Irrigation Canal?

The structure is 47 ft (14.3 m) long with a longest span of 45 ft (13.7 m) and a deck 32 ft wide.

Who owns Anderson RD over Irrigation Canal?

It is owned by the County Highway Agency.