US Bridges

Millport Slough RD over Millport Slough

Good

Lincoln County, Oregon · 015 NE of Shalisham Airpt · Structure no. 41C24 200010065

Built
1980
45 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
153 ft
6 main spans
Daily traffic
77
2020 count
Owner
County
County Highway Agency

About this bridge

Millport Slough RD over Millport Slough is a wood or timber stringer/multi-beam or girder carrying Millport Slough RD over Millport Slough in Lincoln County, Oregon. It was built in 1980, so it is 45 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 77 vehicles a day, projected to reach 106 by 2040. The structure is 153 ft (46.6 m) long and 17 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesMillport Slough RD
CrossesMillport Slough
Location015 NE of Shalisham Airpt
RouteCounty Highway 0
CountyLincoln County
StateOregon
Coordinates44.88744, -123.99649
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.5 US tons
Inventory rating22.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans6
Design loadHS 20
Structure length153 ft (46.6 m)
Longest span30 ft (9.1 m)
Deck width17 ft (5.3 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic77 (2020)
Projected traffic106 by 2040
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$784,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Millport Slough RD over Millport Slough built?

It was built in 1980, making it 45 years old in 2025.

What condition is Millport Slough RD over Millport Slough in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does Millport Slough RD over Millport Slough carry?

About 77 vehicles per day (2020 count).

How long is Millport Slough RD over Millport Slough?

The structure is 153 ft (46.6 m) long with a longest span of 30 ft (9.1 m) and a deck 17 ft wide.

Who owns Millport Slough RD over Millport Slough?

It is owned by the County Highway Agency.