US Bridges

Richardson Gap N. over Thomas Creek

FairPosted for load

Linn County, Oregon · 07 MI N FAS 118 · Structure no. 12965 063700070

Built
1966
59 years old, rebuilt 2022
Condition
Fair
inspected July 2024
Type
Truss - Thru
Wood or Timber
Length
226 ft
1 main span
Daily traffic
1,236
2021 count
Owner
County
County Highway Agency

About this bridge

Richardson Gap N. over Thomas Creek is a wood or timber truss - thru carrying Richardson Gap N. over Thomas Creek in Linn County, Oregon. It was built in 1966 and reconstructed in 2022, so it is 59 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 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: posted for other load-capacity restriction.

It carries about 1,236 vehicles a day, roughly 6% of them trucks, projected to reach 1,751 by 2041. The structure is 226 ft (68.9 m) long and 22 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesRichardson Gap N.
CrossesThomas Creek
Location07 MI N FAS 118
RouteCounty Highway A0489
CountyLinn County
StateOregon
Coordinates44.71581, -122.80439
Functional classRural Major Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating28.5 US tons
Inventory rating22.2 US tons

Structure

Structure typeTruss - Thru
MaterialWood or Timber
DeckWood or timber
Main spans1 (+3 approach)
Design loadH 20
Structure length226 ft (68.9 m)
Longest span131 ft (39.8 m)
Deck width22 ft (6.7 m)
Roadway width21 ft (6.5 m)
Vertical clearance over deck15 ft (4.6 m)

Traffic and service

Average daily traffic1,236 (2021)
Projected traffic1,751 by 2041
Trucks6%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1.2 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Richardson Gap N. over Thomas Creek built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 2022.

What condition is Richardson Gap N. over Thomas 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 July 2024.

How much traffic does Richardson Gap N. over Thomas Creek carry?

About 1,236 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is Richardson Gap N. over Thomas Creek?

The structure is 226 ft (68.9 m) long with a longest span of 131 ft (39.8 m) and a deck 22 ft wide.

Who owns Richardson Gap N. over Thomas Creek?

It is owned by the County Highway Agency.