US Bridges

Mcquiston Road over Drainage Ditch

Fair

Klamath County, Oregon · 005 MI S 7-MI Road · Structure no. 35C153134300050

Built
1978
47 years old
Condition
Fair
inspected March 2023
Type
Slab
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
32
2020 count
Owner
County
County Highway Agency

About this bridge

Mcquiston Road over Drainage Ditch is a prestressed concrete slab carrying Mcquiston Road over Drainage Ditch in Klamath County, Oregon. It was built in 1978, so it is 47 years old, younger 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 32 vehicles a day, roughly 10% of them trucks, projected to reach 37 by 2025. The structure is 31 ft (9.4 m) long and 32 ft wide. If it were closed, the detour would be 27.3 mi (44 km).

CarriesMcquiston Road
CrossesDrainage Ditch
Location005 MI S 7-MI Road
RouteCounty Highway C1343
StateOregon
Coordinates42.66098, -122.04512
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98 US tons
Inventory rating60 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span29 ft (8.8 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32 (2020)
Projected traffic37 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed27.3 mi (44 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mcquiston Road over Drainage Ditch built?

It was built in 1978, making it 47 years old in 2025.

What condition is Mcquiston Road over Drainage Ditch 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 March 2023.

How much traffic does Mcquiston Road over Drainage Ditch carry?

About 32 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Mcquiston Road over Drainage Ditch?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.8 m) and a deck 32 ft wide.

Who owns Mcquiston Road over Drainage Ditch?

It is owned by the County Highway Agency.