US Bridges

Blair Road over Drain #115

Fair

Gratiot County, Michigan · Sec 11-12 North Star Twp · Structure no. 000000000003234

Built
1978
47 years old
Condition
Fair
inspected July 2024
Type
Culvert
Steel
Length
25 ft
1 main span
Daily traffic
117
2004 count
Owner
County
County Highway Agency

About this bridge

Blair Road over Drain #115 is a steel culvert carrying Blair Road over Drain #115 in Gratiot County, Michigan. It was built in 1978, so it is 47 years old, younger 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 117 vehicles a day, projected to reach 144 by 2024. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesBlair Road
CrossesDrain #115
LocationSec 11-12 North Star Twp
RouteCounty Highway 0
CountyGratiot County
StateMichigan
Coordinates43.26447, -84.50386
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 inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating50.2 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHS 20 + Mod
Structure length25 ft (7.6 m)
Longest span25 ft (7.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic117 (2004)
Projected traffic144 by 2024
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Blair Road over Drain #115 built?

It was built in 1978, making it 47 years old in 2025.

What condition is Blair Road over Drain #115 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 July 2024.

How much traffic does Blair Road over Drain #115 carry?

About 117 vehicles per day (2004 count).

How long is Blair Road over Drain #115?

The structure is 25 ft (7.6 m) long with a longest span of 25 ft (7.6 m).

Who owns Blair Road over Drain #115?

It is owned by the County Highway Agency.