US Bridges

Brown Road over Donigan Drain

FairPosted for load

Tuscola County, Michigan · Sec 29-32 Vassar Twp · Structure no. 000000000010648

Built
1963
62 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
23 ft
1 main span
Daily traffic
1,520
2009 count
Owner
County
County Highway Agency

About this bridge

Brown Road over Donigan Drain is a steel stringer/multi-beam or girder carrying Brown Road over Donigan Drain in Tuscola County, Michigan. It was built in 1963, so it is 62 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. Its operating status is: posted for load restriction.

It carries about 1,520 vehicles a day, projected to reach 2,745 by 2029. The structure is 23 ft (7 m) long and 26 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesBrown Road
CrossesDonigan Drain
LocationSec 29-32 Vassar Twp
RouteCounty Highway 0
CountyTuscola County
StateMichigan
Coordinates43.32231, -83.55214
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.7 US tons
Inventory rating27.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length23 ft (7 m)
Longest span22 ft (6.6 m)
Deck width26 ft (8 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,520 (2009)
Projected traffic2,745 by 2029
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$180,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Brown Road over Donigan Drain built?

It was built in 1963, making it 62 years old in 2025.

What condition is Brown Road over Donigan Drain 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 November 2024.

How much traffic does Brown Road over Donigan Drain carry?

About 1,520 vehicles per day (2009 count).

How long is Brown Road over Donigan Drain?

The structure is 23 ft (7 m) long with a longest span of 22 ft (6.6 m) and a deck 26 ft wide.

Who owns Brown Road over Donigan Drain?

It is owned by the County Highway Agency.