US Bridges

SR 8 over Cobb Ditch

Fair

Porter County, Indiana · 02.92 W SR 49 · Structure no. 002130

Built
1952
73 years old, rebuilt 1996
Condition
Fair
inspected December 2024
Type
Slab
Concrete Continuous
Length
62 ft
3 main spans
Daily traffic
4,768
2022 count
Owner
State
State Highway Agency

About this bridge

SR 8 over Cobb Ditch is a concrete continuous slab carrying SR 8 over Cobb Ditch in Porter County, Indiana. It was built in 1952 and reconstructed in 1996, so it is 73 years old, older than the Indiana average of 46.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 4,768 vehicles a day, roughly 26% of them trucks, projected to reach 5,850 by 2030. The structure is 62 ft (18.8 m) long and 31 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

Location

Open in Google Maps
CarriesSR 8
CrossesCobb Ditch
Location02.92 W SR 49
RouteState Highway 8
CountyPorter County
StateIndiana
Coordinates41.3185, -87.08233
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating30.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length62 ft (18.8 m)
Longest span24 ft (7.2 m)
Deck width31 ft (9.6 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,768 (2022)
Projected traffic5,850 by 2030
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5.6 mi (9 km)
TollOn a free road
National Highway SystemNo

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 SR 8 over Cobb Ditch built?

It was built in 1952, making it 73 years old in 2025. It was reconstructed in 1996.

What condition is SR 8 over Cobb 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 December 2024.

How much traffic does SR 8 over Cobb Ditch carry?

About 4,768 vehicles per day (2022 count), of which roughly 26% are trucks.

How long is SR 8 over Cobb Ditch?

The structure is 62 ft (18.8 m) long with a longest span of 24 ft (7.2 m) and a deck 31 ft wide.

Who owns SR 8 over Cobb Ditch?

It is owned by the State Highway Agency.