US Bridges

Dolphin Road over Skipanon River

Fair

Clatsop County, Oregon · 021 MI S of Warrenton · Structure no. 07C05 090400070

Built
1963
62 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
61 ft
3 main spans
Daily traffic
218
2020 count
Owner
County
County Highway Agency

About this bridge

Dolphin Road over Skipanon River is a steel continuous stringer/multi-beam or girder carrying Dolphin Road over Skipanon River in Clatsop 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.

It carries about 218 vehicles a day, roughly 10% of them trucks, projected to reach 238 by 2025. The structure is 61 ft (18.6 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesDolphin Road
CrossesSkipanon River
Location021 MI S of Warrenton
RouteCounty Highway C0904
CountyClatsop County
StateOregon
Coordinates46.13268, -123.92082
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating26.5 US tons
Inventory rating20.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckCorrugated steel
Main spans3
Design loadUnknown
Structure length61 ft (18.6 m)
Longest span20 ft (6.1 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic218 (2020)
Projected traffic238 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$313,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Dolphin Road over Skipanon River built?

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

What condition is Dolphin Road over Skipanon River 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 April 2023.

How much traffic does Dolphin Road over Skipanon River carry?

About 218 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Dolphin Road over Skipanon River?

The structure is 61 ft (18.6 m) long with a longest span of 20 ft (6.1 m) and a deck 24 ft wide.

Who owns Dolphin Road over Skipanon River?

It is owned by the County Highway Agency.