US Bridges

Flack Rd. (CR#722) over Rock Creek

FairPosted for load

Columbia County, Oregon · 020 MI NW of Vernonia · Structure no. 09C126072200040

Built
1973
52 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
58 ft
1 main span
Daily traffic
30
2020 count
Owner
County
County Highway Agency

About this bridge

Flack Rd. (CR#722) over Rock Creek is a steel stringer/multi-beam or girder carrying Flack Rd. (CR#722) over Rock Creek in Columbia County, Oregon. It was built in 1973, so it is 52 years old, older 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. Its operating status is: posted for other load-capacity restriction.

It carries about 30 vehicles a day, roughly 15% of them trucks, projected to reach 35 by 2025. The structure is 58 ft (17.7 m) long and 14 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesFlack Rd. (CR#722)
CrossesRock Creek
Location020 MI NW of Vernonia
RouteCounty Highway C0722
CountyColumbia County
StateOregon
Coordinates45.87458, -123.22668
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.7 US tons
Inventory rating42.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length58 ft (17.7 m)
Longest span56 ft (17.1 m)
Deck width14 ft (4.3 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2020)
Projected traffic35 by 2025
Trucks15%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Flack Rd. (CR#722) over Rock Creek built?

It was built in 1973, making it 52 years old in 2025.

What condition is Flack Rd. (CR#722) over Rock Creek 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 May 2023.

How much traffic does Flack Rd. (CR#722) over Rock Creek carry?

About 30 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Flack Rd. (CR#722) over Rock Creek?

The structure is 58 ft (17.7 m) long with a longest span of 56 ft (17.1 m) and a deck 14 ft wide.

Who owns Flack Rd. (CR#722) over Rock Creek?

It is owned by the County Highway Agency.