US Bridges

Chiloquin Ridge RD over Sprague River

Fair

Klamath County, Oregon · 001 MI S of Sprague R RD · Structure no. 35C120065200010

Built
1958
67 years old
Condition
Fair
inspected July 2023
Type
Tee Beam
Concrete Continuous
Length
182 ft
3 main spans
Daily traffic
105
2020 count
Owner
County
County Highway Agency

About this bridge

Chiloquin Ridge RD over Sprague River is a concrete continuous tee beam carrying Chiloquin Ridge RD over Sprague River in Klamath County, Oregon. It was built in 1958, so it is 67 years old, older 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 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 105 vehicles a day, roughly 10% of them trucks, projected to reach 120 by 2025. The structure is 182 ft (55.5 m) long and 27 ft wide. If it were closed, the detour would be 13 mi (21 km).

CarriesChiloquin Ridge RD
CrossesSprague River
Location001 MI S of Sprague R RD
RouteCounty Highway C0652
StateOregon
Coordinates42.58441, -121.84284
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating17.5 US tons
Inventory rating13.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length182 ft (55.5 m)
Longest span70 ft (21.3 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic105 (2020)
Projected traffic120 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 Chiloquin Ridge RD over Sprague River built?

It was built in 1958, making it 67 years old in 2025.

What condition is Chiloquin Ridge RD over Sprague River 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 July 2023.

How much traffic does Chiloquin Ridge RD over Sprague River carry?

About 105 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Chiloquin Ridge RD over Sprague River?

The structure is 182 ft (55.5 m) long with a longest span of 70 ft (21.3 m) and a deck 27 ft wide.

Who owns Chiloquin Ridge RD over Sprague River?

It is owned by the County Highway Agency.