US Bridges

SB US 61 over Ia 136

Good

Clinton County, Iowa · At Jct. of Ia. 136 · Structure no. 000000000601705

Built
1995
30 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
196 ft
3 main spans
Daily traffic
4,350
2022 count
Owner
State
State Highway Agency

About this bridge

SB US 61 over Ia 136 is a prestressed concrete stringer/multi-beam or girder carrying SB US 61 over Ia 136 in Clinton County, Iowa. It was built in 1995, so it is 30 years old, younger than the Iowa average of 45.5 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 4,350 vehicles a day, roughly 23% of them trucks, projected to reach 4,350 by 2043. The structure is 196 ft (59.7 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSB US 61
CrossesIa 136
LocationAt Jct. of Ia. 136
RouteU.S. Route 61
CountyClinton County
StateIowa
Coordinates42.00387, -90.65742
Functional classRural Principal Arterial - Other

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.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.2 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length196 ft (59.7 m)
Longest span92 ft (28 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,350 (2022)
Projected traffic4,350 by 2043
Trucks23%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 SB US 61 over Ia 136 built?

It was built in 1995, making it 30 years old in 2025.

What condition is SB US 61 over Ia 136 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 July 2023.

How much traffic does SB US 61 over Ia 136 carry?

About 4,350 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is SB US 61 over Ia 136?

The structure is 196 ft (59.7 m) long with a longest span of 92 ft (28 m) and a deck 43 ft wide.

Who owns SB US 61 over Ia 136?

It is owned by the State Highway Agency.