US Bridges

Black Rock Road over Little Luckiamute River

Fair

Polk County, Oregon · 006 W Falls City · Structure no. T53C00386120006

Built
2024
1 years old
Condition
Fair
inspected August 2024
Type
Truss - Thru
Steel
Length
85 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 steel truss - thru 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: open, temporary structure in place while original is closed.

It carries about 343 vehicles a day, roughly 15% of them trucks, projected to reach 437 by 2040. The structure is 85 ft (25.9 m) long and 18 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesBlack Rock Road
CrossesLittle Luckiamute River
Location006 W Falls City
RouteCounty Highway 0
CountyPolk County
StateOregon
Coordinates44.86985, -123.45111
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, temporary structure in place while original is closed
ScourUnknown foundation; not evaluated for scour
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating0 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length85 ft (25.9 m)
Longest span80 ft (24.4 m)
Deck width18 ft (5.4 m)
Roadway width16 ft (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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$435,000
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 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 August 2024.

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 85 ft (25.9 m) long with a longest span of 80 ft (24.4 m) and a deck 18 ft wide.

Who owns Black Rock Road over Little Luckiamute River?

It is owned by the County Highway Agency.