US Bridges

Lyons-Mill City DR over De Ford Creek

Fair

Linn County, Oregon · 1.0 MI SW Mill City · Structure no. 06646 000600646

Built
1976
49 years old
Condition
Fair
inspected July 2023
Type
Slab
Prestressed Concrete
Length
142 ft
3 main spans
Daily traffic
1,906
2021 count
Owner
County
County Highway Agency

About this bridge

Lyons-Mill City DR over De Ford Creek is a prestressed concrete slab carrying Lyons-Mill City DR over De Ford Creek in Linn County, Oregon. It was built in 1976, so it is 49 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.

It carries about 1,906 vehicles a day, roughly 15% of them trucks, projected to reach 3,219 by 2041. The structure is 142 ft (43.3 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesLyons-Mill City DR
CrossesDe Ford Creek
Location1.0 MI SW Mill City
RouteCounty Highway A0487
StateOregon
Coordinates44.74782, -122.49619
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating67.5 US tons
Inventory rating52.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20
Structure length142 ft (43.3 m)
Longest span47 ft (14.3 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,906 (2021)
Projected traffic3,219 by 2041
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Lyons-Mill City DR over De Ford Creek built?

It was built in 1976, making it 49 years old in 2025.

What condition is Lyons-Mill City DR over De Ford 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 2023.

How much traffic does Lyons-Mill City DR over De Ford Creek carry?

About 1,906 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is Lyons-Mill City DR over De Ford Creek?

The structure is 142 ft (43.3 m) long with a longest span of 47 ft (14.3 m) and a deck 44 ft wide.

Who owns Lyons-Mill City DR over De Ford Creek?

It is owned by the County Highway Agency.