US Bridges

Nicholson Hill RD over Lwr S Br Thunder Bay Riv

Fair

Alpena County, Michigan · Betw Sec 15&22 T29N R7E · Structure no. 000000000000337

Built
1964
61 years old
Condition
Fair
inspected August 2024
Type
Culvert
Steel
Length
38 ft
2 main spans
Daily traffic
1,000
2010 count
Owner
County
County Highway Agency

About this bridge

Nicholson Hill RD over Lwr S Br Thunder Bay Riv is a steel culvert carrying Nicholson Hill RD over Lwr S Br Thunder Bay Riv in Alpena County, Michigan. It was built in 1964, so it is 61 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 1,000 vehicles a day, projected to reach 1,200 by 2030. The structure is 38 ft (11.5 m) long. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesNicholson Hill RD
CrossesLwr S Br Thunder Bay Riv
LocationBetw Sec 15&22 T29N R7E
RouteCounty Highway 412
CountyAlpena County
StateMichigan
Coordinates44.90272, -83.5764
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
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating107.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length38 ft (11.5 m)
Longest span15 ft (4.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2010)
Projected traffic1,200 by 2030
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 Nicholson Hill RD over Lwr S Br Thunder Bay Riv built?

It was built in 1964, making it 61 years old in 2025.

What condition is Nicholson Hill RD over Lwr S Br Thunder Bay Riv 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 Nicholson Hill RD over Lwr S Br Thunder Bay Riv carry?

About 1,000 vehicles per day (2010 count).

How long is Nicholson Hill RD over Lwr S Br Thunder Bay Riv?

The structure is 38 ft (11.5 m) long with a longest span of 15 ft (4.7 m).

Who owns Nicholson Hill RD over Lwr S Br Thunder Bay Riv?

It is owned by the County Highway Agency.