US Bridges

Seven Mile LN over Swale/Overflow

Poor

Linn County, Oregon · 060 Mile NW Brownsville · Structure no. 22C09 001101129

Built
1963
62 years old
Condition
Poor
inspected October 2024
Type
Slab
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
566
2021 count
Owner
County
County Highway Agency

About this bridge

Seven Mile LN over Swale/Overflow is a prestressed concrete slab carrying Seven Mile LN over Swale/Overflow in Linn 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 poor condition with a lowest component rating of 4 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 566 vehicles a day, roughly 10% of them trucks, projected to reach 721 by 2041. The structure is 24 ft (7.3 m) long and 30 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

CarriesSeven Mile LN
CrossesSwale/Overflow
Location060 Mile NW Brownsville
RouteCounty Highway C0011
StateOregon
Coordinates44.46588, -123.03924
Functional classRural Major Collector

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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, would be posted or closed except for temporary shoring
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating47.2 US tons
Inventory rating36.4 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span22 ft (6.7 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic566 (2021)
Projected traffic721 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed2.5 mi (4 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$160,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Seven Mile LN over Swale/Overflow built?

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

What condition is Seven Mile LN over Swale/Overflow 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 Seven Mile LN over Swale/Overflow carry?

About 566 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Seven Mile LN over Swale/Overflow?

The structure is 24 ft (7.3 m) long with a longest span of 22 ft (6.7 m) and a deck 30 ft wide.

Who owns Seven Mile LN over Swale/Overflow?

It is owned by the County Highway Agency.