US Bridges

Lrd Somo Dam RD over Little Somo River

Fair

Lincoln County, Wisconsin · 1.4M S JCT Cth Cc · Structure no. P35090800000000

Built
1929
96 years old, rebuilt 1985
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
36 ft
2 main spans
Daily traffic
186
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Lrd Somo Dam RD over Little Somo River is a steel stringer/multi-beam or girder carrying Lrd Somo Dam RD over Little Somo River in Lincoln County, Wisconsin. It was built in 1929 and reconstructed in 1985, so it is 96 years old, older 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 186 vehicles a day, projected to reach 198 by 2043. The structure is 36 ft (10.9 m) long and 26 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

CarriesLrd Somo Dam RD
CrossesLittle Somo River
Location1.4M S JCT Cth Cc
RouteCity Street 0
Coordinates45.49677, -89.84583
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 rating59.4 US tons
Inventory rating35.7 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length36 ft (10.9 m)
Longest span18 ft (5.4 m)
Deck width26 ft (7.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic186 (2023)
Projected traffic198 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 Somo Dam RD over Little Somo River built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1985.

What condition is Lrd Somo Dam RD over Little Somo 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 June 2024.

How much traffic does Lrd Somo Dam RD over Little Somo River carry?

About 186 vehicles per day (2023 count).

How long is Lrd Somo Dam RD over Little Somo River?

The structure is 36 ft (10.9 m) long with a longest span of 18 ft (5.4 m) and a deck 26 ft wide.

Who owns Lrd Somo Dam RD over Little Somo River?

It is owned by the Town or Township Highway Agency.