US Bridges

SR 49 over Ahlgrim Ditch

Fair

Porter County, Indiana · 03.10 N SR 8 · Structure no. 017974

Built
1940
85 years old, rebuilt 2001
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
8,230
2022 count
Owner
State
State Highway Agency

About this bridge

SR 49 over Ahlgrim Ditch is a prestressed concrete stringer/multi-beam or girder carrying SR 49 over Ahlgrim Ditch in Porter County, Indiana. It was built in 1940 and reconstructed in 2001, so it is 85 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 8,230 vehicles a day, roughly 21% of them trucks, projected to reach 12,375 by 2030. The structure is 31 ft (9.4 m) long and 47 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSR 49
CrossesAhlgrim Ditch
Location03.10 N SR 8
RouteState Highway 49
CountyPorter County
StateIndiana
Coordinates41.36345, -87.02701
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 protection7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.2 US tons
Inventory rating32.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span29 ft (8.9 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,230 (2022)
Projected traffic12,375 by 2030
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 49 over Ahlgrim Ditch built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 2001.

What condition is SR 49 over Ahlgrim 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 January 2023.

How much traffic does SR 49 over Ahlgrim Ditch carry?

About 8,230 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is SR 49 over Ahlgrim Ditch?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.9 m) and a deck 47 ft wide.

Who owns SR 49 over Ahlgrim Ditch?

It is owned by the State Highway Agency.