US Bridges

Southside Bypass over 1 C Ditch

Fair

Klamath County, Oregon · 0 · Structure no. 35C34 424 00340

Built
1979
46 years old
Condition
Fair
inspected February 2024
Type
Slab
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
10,777
2022 count
Owner
State
State Highway Agency

About this bridge

Southside Bypass over 1 C Ditch is a prestressed concrete slab carrying Southside Bypass over 1 C Ditch in Klamath County, Oregon. It was built in 1979, so it is 46 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 10,777 vehicles a day, roughly 16% of them trucks, projected to reach 13,600 by 2042. The structure is 24 ft (7.3 m) long and 56 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesSouthside Bypass
Crosses1 C Ditch
Location0
RouteState Highway 140
CountyKlamath County
StateOregon
Coordinates42.17366, -121.74476
Functional classUrban Other Principal Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating31.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span23 ft (7 m)
Deck width56 ft (17.1 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,777 (2022)
Projected traffic13,600 by 2042
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Southside Bypass over 1 C Ditch built?

It was built in 1979, making it 46 years old in 2025.

What condition is Southside Bypass over 1 C 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 February 2024.

How much traffic does Southside Bypass over 1 C Ditch carry?

About 10,777 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is Southside Bypass over 1 C Ditch?

The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 56 ft wide.

Who owns Southside Bypass over 1 C Ditch?

It is owned by the State Highway Agency.