US Bridges

Fly Ridge Road over Grande Ronde R.

Good

Union County, Oregon · No Data Entered · Structure no. 061606000001092

Built
1987
38 years old
Condition
Good
inspected August 2021
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
58 ft
1 main span
Daily traffic
20
2001 count
Owner
Federal
U.S. Forest Service

About this bridge

Fly Ridge Road over Grande Ronde R. is a prestressed concrete stringer/multi-beam or girder carrying Fly Ridge Road over Grande Ronde R. in Union County, Oregon. It was built in 1987, so it is 38 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 20 vehicles a day, projected to reach 30 by 2045. The structure is 58 ft (17.7 m) long and 16 ft wide. If it were closed, the detour would be 620.7 mi (999 km).

Location

Open in Google Maps
CarriesFly Ridge Road
CrossesGrande Ronde R.
LocationNo Data Entered
RouteFederal Lands Road 51150
CountyUnion County
StateOregon
Coordinates45.15896, -118.3804
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 alignment6: Equal to present minimum criteria
Operating rating74.1 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length58 ft (17.7 m)
Longest span56 ft (17.1 m)
Deck width16 ft (5 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2001)
Projected traffic30 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed620.7 mi (999 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Fly Ridge Road over Grande Ronde R. built?

It was built in 1987, making it 38 years old in 2025.

What condition is Fly Ridge Road over Grande Ronde R. 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 2021.

How much traffic does Fly Ridge Road over Grande Ronde R. carry?

About 20 vehicles per day (2001 count).

How long is Fly Ridge Road over Grande Ronde R.?

The structure is 58 ft (17.7 m) long with a longest span of 56 ft (17.1 m) and a deck 16 ft wide.

Who owns Fly Ridge Road over Grande Ronde R.?

It is owned by the U.S. Forest Service.