US Bridges

Lower Bridge RD over Deschutes River

Good

Deschutes County, Oregon · 0.1MI No of Diomite Mine · Structure no. 15450A030 00634

Built
1978
47 years old
Condition
Good
inspected February 2023
Type
Tee Beam
Prestressed Concrete
Length
122 ft
1 main span
Daily traffic
780
2020 count
Owner
County
County Highway Agency

About this bridge

Lower Bridge RD over Deschutes River is a prestressed concrete tee beam carrying Lower Bridge RD over Deschutes River in Deschutes 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 780 vehicles a day, roughly 2% of them trucks, projected to reach 900 by 2025. The structure is 122 ft (37.2 m) long and 36 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

CarriesLower Bridge RD
CrossesDeschutes River
Location0.1MI No of Diomite Mine
RouteCounty Highway 2177
StateOregon
Coordinates44.35972, -121.29449
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 inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be 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 rating20.7 US tons
Inventory rating16.1 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length122 ft (37.2 m)
Longest span120 ft (36.6 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic780 (2020)
Projected traffic900 by 2025
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 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 Lower Bridge RD over Deschutes River built?

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

What condition is Lower Bridge RD over Deschutes 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 February 2023.

How much traffic does Lower Bridge RD over Deschutes River carry?

About 780 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Lower Bridge RD over Deschutes River?

The structure is 122 ft (37.2 m) long with a longest span of 120 ft (36.6 m) and a deck 36 ft wide.

Who owns Lower Bridge RD over Deschutes River?

It is owned by the County Highway Agency.