US Bridges

Pierce Road over Grande Ronde River

Good

Union County, Oregon · 1.1 MI S of HWY 82 · Structure no. 16317 023 00675

Built
1978
47 years old
Condition
Good
inspected September 2023
Type
Tee Beam
Prestressed Concrete
Length
132 ft
1 main span
Daily traffic
946
2020 count
Owner
County
County Highway Agency

About this bridge

Pierce Road over Grande Ronde River is a prestressed concrete tee beam carrying Pierce Road over Grande Ronde River in Union County, Oregon. It was built in 1978, so it is 47 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 946 vehicles a day, roughly 15% of them trucks, projected to reach 1,121 by 2025. The structure is 132 ft (40.2 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesPierce Road
CrossesGrande Ronde River
Location1.1 MI S of HWY 82
RouteCounty Highway 0
CountyUnion County
StateOregon
Coordinates45.34302, -118.01436
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating25.4 US tons
Inventory rating19.6 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length132 ft (40.2 m)
Longest span130 ft (39.6 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic946 (2020)
Projected traffic1,121 by 2025
Trucks15%
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 Pierce Road over Grande Ronde River built?

It was built in 1978, making it 47 years old in 2025.

What condition is Pierce Road over Grande Ronde River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does Pierce Road over Grande Ronde River carry?

About 946 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Pierce Road over Grande Ronde River?

The structure is 132 ft (40.2 m) long with a longest span of 130 ft (39.6 m) and a deck 31 ft wide.

Who owns Pierce Road over Grande Ronde River?

It is owned by the County Highway Agency.