US Bridges

Old Military Road over Mill Creek

FairPosted for load

Polk County, Oregon · 001 E of County Road 6610 · Structure no. 53C063076600010

Built
1963
62 years old
Condition
Fair
inspected August 2024
Type
Truss - Thru
Steel
Length
118 ft
1 main span
Daily traffic
108
2021 count
Owner
County
County Highway Agency

About this bridge

Old Military Road over Mill Creek is a steel truss - thru carrying Old Military Road over Mill Creek in Polk County, Oregon. It was built in 1963, so it is 62 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 load restriction.

It carries about 108 vehicles a day, projected to reach 149 by 2041. The structure is 118 ft (36 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesOld Military Road
CrossesMill Creek
Location001 E of County Road 6610
RouteCounty Highway 0
CountyPolk County
StateOregon
Coordinates44.99494, -123.41972
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
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 inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating9.3 US tons
Inventory rating7.2 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1 (+2 approach)
Design loadH 10
Structure length118 ft (36 m)
Longest span72 ft (21.9 m)
Deck width16 ft (4.8 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic108 (2021)
Projected traffic149 by 2041
Trucks0%
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$605,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Military Road over Mill Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is Old Military Road over Mill 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 August 2024.

How much traffic does Old Military Road over Mill Creek carry?

About 108 vehicles per day (2021 count).

How long is Old Military Road over Mill Creek?

The structure is 118 ft (36 m) long with a longest span of 72 ft (21.9 m) and a deck 16 ft wide.

Who owns Old Military Road over Mill Creek?

It is owned by the County Highway Agency.