US Bridges

Patterson RD over John Day River

Fair

Grant County, Oregon · 0.05 M N. JCT HWY 26 · Structure no. 23B005000000000

Built
1990
35 years old
Condition
Fair
inspected August 2023
Type
Slab
Prestressed Concrete
Length
69 ft
1 main span
Daily traffic
35
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Patterson RD over John Day River is a prestressed concrete slab carrying Patterson RD over John Day River in Grant County, Oregon. It was built in 1990, so it is 35 years old, younger 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 35 vehicles a day, projected to reach 45 by 2025. The structure is 69 ft (21 m) long and 32 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesPatterson RD
CrossesJohn Day River
Location0.05 M N. JCT HWY 26
RouteCity Street C0000
CountyGrant County
StateOregon
Coordinates44.42061, -118.97423
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68 US tons
Inventory rating41 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length69 ft (21 m)
Longest span66 ft (20.1 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2020)
Projected traffic45 by 2025
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Patterson RD over John Day River built?

It was built in 1990, making it 35 years old in 2025.

What condition is Patterson RD over John Day 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 August 2023.

How much traffic does Patterson RD over John Day River carry?

About 35 vehicles per day (2020 count).

How long is Patterson RD over John Day River?

The structure is 69 ft (21 m) long with a longest span of 66 ft (20.1 m) and a deck 32 ft wide.

Who owns Patterson RD over John Day River?

It is owned by the City or Municipal Highway Agency.