US Bridges

Lewis & Clark RD over Mcewan Slough

FairPosted for load

Clatsop County, Oregon · 034 MI SW Miles Crossing · Structure no. 11185A080900344

Built
1955
70 years old
Condition
Fair
inspected April 2023
Type
Channel Beam
Concrete
Length
51 ft
3 main spans
Daily traffic
1,237
2020 count
Owner
County
County Highway Agency

About this bridge

Lewis & Clark RD over Mcewan Slough is a concrete channel beam carrying Lewis & Clark RD over Mcewan Slough in Clatsop County, Oregon. It was built in 1955, so it is 70 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 1,237 vehicles a day, roughly 10% of them trucks, projected to reach 1,307 by 2025. The structure is 51 ft (15.5 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLewis & Clark RD
CrossesMcewan Slough
Location034 MI SW Miles Crossing
RouteCounty Highway A0731
CountyClatsop County
StateOregon
Coordinates46.10939, -123.85449
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25 US tons
Inventory rating19.3 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadH 20
Structure length51 ft (15.5 m)
Longest span17 ft (5.2 m)
Deck width30 ft (9 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,237 (2020)
Projected traffic1,307 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 statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Lewis & Clark RD over Mcewan Slough built?

It was built in 1955, making it 70 years old in 2025.

What condition is Lewis & Clark RD over Mcewan Slough 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 Lewis & Clark RD over Mcewan Slough carry?

About 1,237 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Lewis & Clark RD over Mcewan Slough?

The structure is 51 ft (15.5 m) long with a longest span of 17 ft (5.2 m) and a deck 30 ft wide.

Who owns Lewis & Clark RD over Mcewan Slough?

It is owned by the County Highway Agency.