US Bridges

FR183 over Iron River

Fair

Ashland County, Wisconsin · 4.0 M. S. JCT Cth Gg · Structure no. 090202000001018

Built
1988
37 years old
Condition
Fair
inspected July 2023
Type
Slab
Wood or Timber
Length
35 ft
2 main spans
Daily traffic
20
1978 count
Owner
Federal
U.S. Forest Service

About this bridge

FR183 over Iron River is a wood or timber slab carrying FR183 over Iron River in Ashland County, Wisconsin. It was built in 1988, so it is 37 years old, younger than the Wisconsin average of 40.3 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.

It carries about 20 vehicles a day, projected to reach 30 by 2045. The structure is 35 ft (10.7 m) long and 26 ft wide. If it were closed, the detour would be 22.4 mi (36 km).

Location

Open in Google Maps
CarriesFR183
CrossesIron River
Location4.0 M. S. JCT Cth Gg
RouteFederal Lands Road 183
CountyAshland County
StateWisconsin
Coordinates46.2348, -90.7833
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating30.3 US tons
Inventory rating23.6 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 20
Structure length35 ft (10.7 m)
Longest span17 ft (5.1 m)
Deck width26 ft (7.8 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (1978)
Projected traffic30 by 2045
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed22.4 mi (36 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was FR183 over Iron River built?

It was built in 1988, making it 37 years old in 2025.

What condition is FR183 over Iron 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 July 2023.

How much traffic does FR183 over Iron River carry?

About 20 vehicles per day (1978 count).

How long is FR183 over Iron River?

The structure is 35 ft (10.7 m) long with a longest span of 17 ft (5.1 m) and a deck 26 ft wide.

Who owns FR183 over Iron River?

It is owned by the U.S. Forest Service.