US Bridges

Wyatt Drive over Curtis Slough

Poor

Linn County, Oregon · 4.5 MI S Harrisburg · Structure no. 12390A023600038

Built
1986
39 years old
Condition
Poor
inspected May 2024
Type
Slab
Prestressed Concrete
Length
180 ft
5 main spans
Daily traffic
309
2021 count
Owner
County
County Highway Agency

About this bridge

Wyatt Drive over Curtis Slough is a prestressed concrete slab carrying Wyatt Drive over Curtis Slough in Linn County, Oregon. It was built in 1986, so it is 39 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: open, would be posted or closed except for temporary shoring.

It carries about 309 vehicles a day, roughly 10% of them trucks, projected to reach 433 by 2041. The structure is 180 ft (54.9 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesWyatt Drive
CrossesCurtis Slough
Location4.5 MI S Harrisburg
RouteCounty Highway C0236
StateOregon
Coordinates44.21812, -123.13543
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusOpen, would be posted or closed except for temporary shoring
ScourUnknown foundation; not evaluated for scour
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.8 US tons
Inventory rating25.4 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans5
Design loadHS 20
Structure length180 ft (54.9 m)
Longest span35 ft (10.7 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic309 (2021)
Projected traffic433 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-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 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 Wyatt Drive over Curtis Slough built?

It was built in 1986, making it 39 years old in 2025.

What condition is Wyatt Drive over Curtis Slough in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.

How much traffic does Wyatt Drive over Curtis Slough carry?

About 309 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Wyatt Drive over Curtis Slough?

The structure is 180 ft (54.9 m) long with a longest span of 35 ft (10.7 m) and a deck 28 ft wide.

Who owns Wyatt Drive over Curtis Slough?

It is owned by the County Highway Agency.