US Bridges

Lrd Forest Road 21 over N Br Oconto River

GoodPosted for load

Oconto County, Wisconsin · 1.2M S JCT Tar Dam RD · Structure no. P42005000000000

Built
1973
52 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
68 ft
1 main span
Daily traffic
155
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Lrd Forest Road 21 over N Br Oconto River is a prestressed concrete box beam or girders - multiple carrying Lrd Forest Road 21 over N Br Oconto River in Oconto County, Wisconsin. It was built in 1973, so it is 52 years old, older than the Wisconsin average of 40.3 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. Its operating status is: posted for load restriction.

It carries about 155 vehicles a day, projected to reach 170 by 2043. The structure is 68 ft (20.7 m) long and 27 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesLrd Forest Road 21
CrossesN Br Oconto River
Location1.2M S JCT Tar Dam RD
RouteCity Street 0
Coordinates45.23257, -88.47483
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.2 US tons
Inventory rating19.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length68 ft (20.7 m)
Longest span66 ft (20 m)
Deck width27 ft (8.2 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic155 (2022)
Projected traffic170 by 2043
Trucks0%
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

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 Lrd Forest Road 21 over N Br Oconto River built?

It was built in 1973, making it 52 years old in 2025.

What condition is Lrd Forest Road 21 over N Br Oconto 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 2024.

How much traffic does Lrd Forest Road 21 over N Br Oconto River carry?

About 155 vehicles per day (2022 count).

How long is Lrd Forest Road 21 over N Br Oconto River?

The structure is 68 ft (20.7 m) long with a longest span of 66 ft (20 m) and a deck 27 ft wide.

Who owns Lrd Forest Road 21 over N Br Oconto River?

It is owned by the Town or Township Highway Agency.