US Bridges

Silverwood Road over North Br. Flint River

FairPosted for load

Lapeer County, Michigan · Sec. 36 Rich Twp. · Structure no. 000000000005382

Built
1928
97 years old
Condition
Fair
inspected September 2023
Type
Girder and Floorbeam System
Concrete
Length
75 ft
1 main span
Daily traffic
1,322
2020 count
Owner
County
County Highway Agency

About this bridge

Silverwood Road over North Br. Flint River is a concrete girder and floorbeam system carrying Silverwood Road over North Br. Flint River in Lapeer County, Michigan. It was built in 1928, so it is 97 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. Its operating status is: posted for load restriction.

It carries about 1,322 vehicles a day, roughly 5% of them trucks, projected to reach 1,613 by 2040. The structure is 75 ft (22.9 m) long and 29 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesSilverwood Road
CrossesNorth Br. Flint River
LocationSec. 36 Rich Twp.
RouteCounty Highway 4445
CountyLapeer County
StateMichigan
Coordinates43.24556, -83.24716
Functional classRural Major Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating89.6 US tons
Inventory rating53.6 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length75 ft (22.9 m)
Longest span70 ft (21.3 m)
Deck width29 ft (8.9 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,322 (2020)
Projected traffic1,613 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 Silverwood Road over North Br. Flint River built?

It was built in 1928, making it 97 years old in 2025.

What condition is Silverwood Road over North Br. Flint River 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 September 2023.

How much traffic does Silverwood Road over North Br. Flint River carry?

About 1,322 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Silverwood Road over North Br. Flint River?

The structure is 75 ft (22.9 m) long with a longest span of 70 ft (21.3 m) and a deck 29 ft wide.

Who owns Silverwood Road over North Br. Flint River?

It is owned by the County Highway Agency.