US Bridges

Riley Road over Antelope CR

Fair

Jackson County, Oregon · 0.80 Milepost · Structure no. 08485A527 00080

Built
1959
66 years old
Condition
Fair
inspected July 2023
Type
Tee Beam
Concrete Continuous
Length
89 ft
3 main spans
Daily traffic
798
2020 count
Owner
County
County Highway Agency

About this bridge

Riley Road over Antelope CR is a concrete continuous tee beam carrying Riley Road over Antelope CR in Jackson County, Oregon. It was built in 1959, so it is 66 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 798 vehicles a day, roughly 10% of them trucks, projected to reach 933 by 2025. The structure is 89 ft (27.1 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesRiley Road
CrossesAntelope CR
Location0.80 Milepost
RouteCounty Highway C0527
CountyJackson County
StateOregon
Coordinates42.44014, -122.78228
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating31.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length89 ft (27.1 m)
Longest span56 ft (17.1 m)
Deck width29 ft (8.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic798 (2020)
Projected traffic933 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Riley Road over Antelope CR built?

It was built in 1959, making it 66 years old in 2025.

What condition is Riley Road over Antelope CR 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 Riley Road over Antelope CR carry?

About 798 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Riley Road over Antelope CR?

The structure is 89 ft (27.1 m) long with a longest span of 56 ft (17.1 m) and a deck 29 ft wide.

Who owns Riley Road over Antelope CR?

It is owned by the County Highway Agency.