US Bridges

IH 39 SB / IH 90/9 over Cmstpp RR

Fair

Dane County, Wisconsin · 4.5M S JCT Cth I · Structure no. B13009300000000

Built
1959
66 years old, rebuilt 1984
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
180 ft
3 main spans
Daily traffic
34,500
2022 count
Owner
State
State Highway Agency

About this bridge

IH 39 SB / IH 90/9 over Cmstpp RR is a steel continuous stringer/multi-beam or girder carrying IH 39 SB / IH 90/9 over Cmstpp RR in Dane County, Wisconsin. It was built in 1959 and reconstructed in 1984, so it is 66 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 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 34,500 vehicles a day, roughly 13% of them trucks, projected to reach 41,400 by 2042. The structure is 180 ft (55 m) long and 58 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIH 39 SB / IH 90/9
CrossesCmstpp RR
Location4.5M S JCT Cth I
RouteInterstate 39
CountyDane County
StateWisconsin
Coordinates43.19209, -89.34235
Functional classRural Principal Arterial - Interstate

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.2 US tons
Inventory rating30.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length180 ft (55 m)
Longest span67 ft (20.4 m)
Deck width58 ft (17.8 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34,500 (2022)
Projected traffic41,400 by 2042
Trucks13%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was IH 39 SB / IH 90/9 over Cmstpp RR built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1984.

What condition is IH 39 SB / IH 90/9 over Cmstpp RR 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 2023.

How much traffic does IH 39 SB / IH 90/9 over Cmstpp RR carry?

About 34,500 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is IH 39 SB / IH 90/9 over Cmstpp RR?

The structure is 180 ft (55 m) long with a longest span of 67 ft (20.4 m) and a deck 58 ft wide.

Who owns IH 39 SB / IH 90/9 over Cmstpp RR?

It is owned by the State Highway Agency.