US Bridges

Mckennon Lane over Grande Ronde River

Fair

Union County, Oregon · 1.3 MI E of Imbler Road · Structure no. 20176 132 00130

Built
2004
21 years old
Condition
Fair
inspected September 2023
Type
Tee Beam
Prestressed Concrete
Length
194 ft
2 main spans
Daily traffic
108
2020 count
Owner
County
County Highway Agency

About this bridge

Mckennon Lane over Grande Ronde River is a prestressed concrete tee beam carrying Mckennon Lane over Grande Ronde River in Union County, Oregon. It was built in 2004, so it is 21 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 108 vehicles a day, roughly 10% of them trucks, projected to reach 128 by 2025. The structure is 194 ft (59.1 m) long and 31 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesMckennon Lane
CrossesGrande Ronde River
Location1.3 MI E of Imbler Road
RouteCounty Highway 0
CountyUnion County
StateOregon
Coordinates45.43494, -117.93591
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.2 US tons
Inventory rating36.4 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 25 or greater
Structure length194 ft (59.1 m)
Longest span140 ft (42.7 m)
Deck width31 ft (9.6 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic108 (2020)
Projected traffic128 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Mckennon Lane over Grande Ronde River built?

It was built in 2004, making it 21 years old in 2025.

What condition is Mckennon Lane over Grande Ronde 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 September 2023.

How much traffic does Mckennon Lane over Grande Ronde River carry?

About 108 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Mckennon Lane over Grande Ronde River?

The structure is 194 ft (59.1 m) long with a longest span of 140 ft (42.7 m) and a deck 31 ft wide.

Who owns Mckennon Lane over Grande Ronde River?

It is owned by the County Highway Agency.