US Bridges

Olex-Mcnab Road over Willow Creek EB

Fair

Morrow County, Oregon · 0.08 MI W of HWY 74 · Structure no. 08475 052200000

Built
1961
64 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Concrete Continuous
Length
71 ft
3 main spans
Daily traffic
169
2020 count
Owner
County
County Highway Agency

About this bridge

Olex-Mcnab Road over Willow Creek EB is a concrete continuous tee beam carrying Olex-Mcnab Road over Willow Creek EB in Morrow County, Oregon. It was built in 1961, so it is 64 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 169 vehicles a day, roughly 10% of them trucks, projected to reach 204 by 2025. The structure is 71 ft (21.6 m) long and 29 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesOlex-Mcnab Road
CrossesWillow Creek EB
Location0.08 MI W of HWY 74
RouteCounty Highway 0
CountyMorrow County
StateOregon
Coordinates45.50229, -119.89491
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than 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 rating40.3 US tons
Inventory rating31.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length71 ft (21.6 m)
Longest span46 ft (14 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic169 (2020)
Projected traffic204 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 Olex-Mcnab Road over Willow Creek EB built?

It was built in 1961, making it 64 years old in 2025.

What condition is Olex-Mcnab Road over Willow Creek EB 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 Olex-Mcnab Road over Willow Creek EB carry?

About 169 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Olex-Mcnab Road over Willow Creek EB?

The structure is 71 ft (21.6 m) long with a longest span of 46 ft (14 m) and a deck 29 ft wide.

Who owns Olex-Mcnab Road over Willow Creek EB?

It is owned by the County Highway Agency.