US Bridges

Base Line Road over Thornapple Creek

Fair

Ingham County, Michigan · 3.2 MI SW of Stockbridge · Structure no. 000000000003913

Built
1961
64 years old
Condition
Fair
inspected June 2023
Type
Culvert
Steel
Length
20 ft
1 main span
Daily traffic
180
2019 count
Owner
County
County Highway Agency

About this bridge

Base Line Road over Thornapple Creek is a steel culvert carrying Base Line Road over Thornapple Creek in Ingham County, Michigan. It was built in 1961, so it is 64 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 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 180 vehicles a day, projected to reach 220 by 2039. The structure is 20 ft (6.1 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesBase Line Road
CrossesThornapple Creek
Location3.2 MI SW of Stockbridge
RouteCounty Highway 0
CountyIngham County
StateMichigan
Coordinates42.42575, -84.23103
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating74 US tons
Inventory rating44.3 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadH 20
Structure length20 ft (6.1 m)
Longest span20 ft (6.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic180 (2019)
Projected traffic220 by 2039
Trucks0%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$101,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Base Line Road over Thornapple Creek built?

It was built in 1961, making it 64 years old in 2025.

What condition is Base Line Road over Thornapple Creek 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 June 2023.

How much traffic does Base Line Road over Thornapple Creek carry?

About 180 vehicles per day (2019 count).

How long is Base Line Road over Thornapple Creek?

The structure is 20 ft (6.1 m) long with a longest span of 20 ft (6.1 m).

Who owns Base Line Road over Thornapple Creek?

It is owned by the County Highway Agency.