US Bridges

County RD 20A over Mid Fk John Day River

Good

Grant County, Oregon · 0.2 MI N JCT Ore 7 · Structure no. 18475 20A 00016

Built
1999
26 years old
Condition
Good
inspected August 2023
Type
Slab
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
79
2020 count
Owner
County
County Highway Agency

About this bridge

County RD 20A over Mid Fk John Day River is a prestressed concrete slab carrying County RD 20A over Mid Fk John Day River in Grant County, Oregon. It was built in 1999, so it is 26 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 79 vehicles a day, roughly 10% of them trucks, projected to reach 94 by 2025. The structure is 40 ft (12.2 m) long and 29 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesCounty RD 20A
CrossesMid Fk John Day River
Location0.2 MI N JCT Ore 7
RouteCounty Highway C020A
StateOregon
Coordinates44.59685, -118.4934
Functional classRural Local

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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.8 US tons
Inventory rating51.5 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length40 ft (12.2 m)
Longest span39 ft (11.9 m)
Deck width29 ft (8.8 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic79 (2020)
Projected traffic94 by 2025
Trucks10%
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 County RD 20A over Mid Fk John Day River built?

It was built in 1999, making it 26 years old in 2025.

What condition is County RD 20A over Mid Fk John Day 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 August 2023.

How much traffic does County RD 20A over Mid Fk John Day River carry?

About 79 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is County RD 20A over Mid Fk John Day River?

The structure is 40 ft (12.2 m) long with a longest span of 39 ft (11.9 m) and a deck 29 ft wide.

Who owns County RD 20A over Mid Fk John Day River?

It is owned by the County Highway Agency.