US Bridges

M-43 over Lake Lansing Outlet

Fair

Ingham County, Michigan · 0.2 MI E of Park Lake RD · Structure no. 000000000003796

Built
1931
94 years old, rebuilt 1970
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
23 ft
1 main span
Daily traffic
27,408
2007 count
Owner
State
State Highway Agency

About this bridge

M-43 over Lake Lansing Outlet is a prestressed concrete box beam or girders - multiple carrying M-43 over Lake Lansing Outlet in Ingham County, Michigan. It was built in 1931 and reconstructed in 1970, so it is 94 years old, older than the Michigan average of 48.3 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 27,408 vehicles a day, roughly 3% of them trucks, projected to reach 31,097 by 2018. The structure is 23 ft (7 m) long and 90 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesM-43
CrossesLake Lansing Outlet
Location0.2 MI E of Park Lake RD
RouteState Highway 43
CountyIngham County
StateMichigan
Coordinates42.72465, -84.44293
Functional classUrban Minor 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.
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 inspectionAugust 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 geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.1 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length23 ft (7 m)
Longest span22 ft (6.6 m)
Deck width90 ft (27.4 m)
Roadway width72 ft (21.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,408 (2007)
Projected traffic31,097 by 2018
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 M-43 over Lake Lansing Outlet built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1970.

What condition is M-43 over Lake Lansing Outlet 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 August 2024.

How much traffic does M-43 over Lake Lansing Outlet carry?

About 27,408 vehicles per day (2007 count), of which roughly 3% are trucks.

How long is M-43 over Lake Lansing Outlet?

The structure is 23 ft (7 m) long with a longest span of 22 ft (6.6 m) and a deck 90 ft wide.

Who owns M-43 over Lake Lansing Outlet?

It is owned by the State Highway Agency.