US Bridges

SR 312 over Indiana Harbor Canal

Good

Lake County, Indiana · 00.50 E US 20 · Structure no. 076522

Built
2010
15 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
147 ft
3 main spans
Daily traffic
12,308
2021 count
Owner
State
State Highway Agency

About this bridge

SR 312 over Indiana Harbor Canal is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 312 over Indiana Harbor Canal in Lake County, Indiana. It was built in 2010, so it is 15 years old, younger than the Indiana average of 46.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 12,308 vehicles a day, roughly 8% of them trucks, projected to reach 20,600 by 2027. The structure is 147 ft (44.8 m) long and 72 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSR 312
CrossesIndiana Harbor Canal
Location00.50 E US 20
RouteState Highway 312
CountyLake County
StateIndiana
Coordinates41.62934, -87.47116
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.8 US tons
Inventory rating47.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length147 ft (44.8 m)
Longest span49 ft (14.9 m)
Deck width72 ft (21.9 m)
Roadway width60 ft (18.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,308 (2021)
Projected traffic20,600 by 2027
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SR 312 over Indiana Harbor Canal built?

It was built in 2010, making it 15 years old in 2025.

What condition is SR 312 over Indiana Harbor Canal in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2024.

How much traffic does SR 312 over Indiana Harbor Canal carry?

About 12,308 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is SR 312 over Indiana Harbor Canal?

The structure is 147 ft (44.8 m) long with a longest span of 49 ft (14.9 m) and a deck 72 ft wide.

Who owns SR 312 over Indiana Harbor Canal?

It is owned by the State Highway Agency.