US Bridges

Black Rock Road over Little Luckiamute River

Good

Polk County, Oregon · 006 W Falls City · Structure no. 24355 861200063

Built
2024
1 years old
Condition
Good
inspected February 2025
Type
Tee Beam
Prestressed Concrete
Length
113 ft
1 main span
Daily traffic
343
2020 count
Owner
County
County Highway Agency

About this bridge

Black Rock Road over Little Luckiamute River is a prestressed concrete tee beam carrying Black Rock Road over Little Luckiamute River in Polk County, Oregon. It was built in 2024, so it is 1 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 343 vehicles a day, roughly 15% of them trucks, projected to reach 437 by 2040. The structure is 113 ft (34.4 m) long and 31 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesBlack Rock Road
CrossesLittle Luckiamute River
Location006 W Falls City
RouteCounty Highway 0
StateOregon
Coordinates44.86985, -123.45111
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating45 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckNot applicable
Main spans1
Design loadHL 93
Structure length113 ft (34.4 m)
Longest span113 ft (34.4 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic343 (2020)
Projected traffic437 by 2040
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Black Rock Road over Little Luckiamute River built?

It was built in 2024, making it 1 years old in 2025.

What condition is Black Rock Road over Little Luckiamute 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 2025.

How much traffic does Black Rock Road over Little Luckiamute River carry?

About 343 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Black Rock Road over Little Luckiamute River?

The structure is 113 ft (34.4 m) long with a longest span of 113 ft (34.4 m) and a deck 31 ft wide.

Who owns Black Rock Road over Little Luckiamute River?

It is owned by the County Highway Agency.