US Bridges

Allen RD over Small Stream

Poor

Yamhill County, Oregon · 025 MI NW Willamina · Structure no. 71C03 000

Built
1952
73 years old, rebuilt 1967
Condition
Poor
inspected October 2024
Type
Slab
Prestressed Concrete
Length
26 ft
1 main span
Daily traffic
99
2020 count
Owner
County
County Highway Agency

About this bridge

Allen RD over Small Stream is a prestressed concrete slab carrying Allen RD over Small Stream in Yamhill County, Oregon. It was built in 1952 and reconstructed in 1967, so it is 73 years old, older 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.

It carries about 99 vehicles a day, projected to reach 109 by 2025. The structure is 26 ft (7.9 m) long and 20 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesAllen RD
CrossesSmall Stream
Location025 MI NW Willamina
RouteCounty Highway C0405
StateOregon
Coordinates45.10232, -123.52151
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 protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating32.2 US tons
Inventory rating24.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span25 ft (7.6 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic99 (2020)
Projected traffic109 by 2025
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 Allen RD over Small Stream built?

It was built in 1952, making it 73 years old in 2025. It was reconstructed in 1967.

What condition is Allen RD over Small Stream 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 October 2024.

How much traffic does Allen RD over Small Stream carry?

About 99 vehicles per day (2020 count).

How long is Allen RD over Small Stream?

The structure is 26 ft (7.9 m) long with a longest span of 25 ft (7.6 m) and a deck 20 ft wide.

Who owns Allen RD over Small Stream?

It is owned by the County Highway Agency.