US Bridges

Fourmile Road over Eightmile Creek

Fair

Gilliam County, Oregon · 4.4 MI SE of HWY 19 · Structure no. 21C05 453 00493

Built
1958
67 years old
Condition
Fair
inspected July 2023
Type
Channel Beam
Concrete
Length
69 ft
3 main spans
Daily traffic
15
2020 count
Owner
County
County Highway Agency

About this bridge

Fourmile Road over Eightmile Creek is a concrete channel beam carrying Fourmile Road over Eightmile Creek in Gilliam 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 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 15 vehicles a day, roughly 10% of them trucks, projected to reach 15 by 2025. The structure is 69 ft (21 m) long and 27 ft wide. If it were closed, the detour would be 26.7 mi (43 km).

Location

Open in Google Maps
CarriesFourmile Road
CrossesEightmile Creek
Location4.4 MI SE of HWY 19
RouteCounty Highway 0
CountyGilliam County
StateOregon
Coordinates45.6447, -120.0806
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
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 rating50 US tons
Inventory rating38.6 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length69 ft (21 m)
Longest span22 ft (6.7 m)
Deck width27 ft (8.1 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2020)
Projected traffic15 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.7 mi (43 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$459,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Fourmile Road over Eightmile Creek built?

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

What condition is Fourmile Road over Eightmile Creek 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 Fourmile Road over Eightmile Creek carry?

About 15 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Fourmile Road over Eightmile Creek?

The structure is 69 ft (21 m) long with a longest span of 22 ft (6.7 m) and a deck 27 ft wide.

Who owns Fourmile Road over Eightmile Creek?

It is owned by the County Highway Agency.