US Bridges

CO RD S10B(ANGMAN) over Traprock River

Good

Houghton County, Michigan · 2.5 MI East of Laurium · Structure no. 000000000003434

Built
2002
23 years old
Condition
Good
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
59 ft
1 main span
Daily traffic
240
2002 count
Owner
County
County Highway Agency

About this bridge

CO RD S10B(ANGMAN) over Traprock River is a prestressed concrete box beam or girders - multiple carrying CO RD S10B(ANGMAN) over Traprock River in Houghton County, Michigan. It was built in 2002, so it is 23 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 240 vehicles a day, roughly 3% of them trucks, projected to reach 280 by 2021. The structure is 59 ft (18 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesCO RD S10B(ANGMAN)
CrossesTraprock River
Location2.5 MI East of Laurium
RouteCounty Highway 0
Coordinates47.24275, -88.37548
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.5 US tons
Inventory rating43.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length59 ft (18 m)
Longest span59 ft (18 m)
Deck width31 ft (9.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic240 (2002)
Projected traffic280 by 2021
Trucks3%
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was CO RD S10B(ANGMAN) over Traprock River built?

It was built in 2002, making it 23 years old in 2025.

What condition is CO RD S10B(ANGMAN) over Traprock River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does CO RD S10B(ANGMAN) over Traprock River carry?

About 240 vehicles per day (2002 count), of which roughly 3% are trucks.

How long is CO RD S10B(ANGMAN) over Traprock River?

The structure is 59 ft (18 m) long with a longest span of 59 ft (18 m) and a deck 31 ft wide.

Who owns CO RD S10B(ANGMAN) over Traprock River?

It is owned by the County Highway Agency.