US Bridges

US 61 SB over Chalk Ridge RD

Good

Lee County, Iowa · 1.4 Mi. S of Jct. SR J40 · Structure no. 000000000609970

Built
2011
14 years old
Condition
Good
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
163 ft
3 main spans
Daily traffic
2,435
2022 count
Owner
State
State Highway Agency

About this bridge

US 61 SB over Chalk Ridge RD is a prestressed concrete stringer/multi-beam or girder carrying US 61 SB over Chalk Ridge RD in Lee County, Iowa. It was built in 2011, so it is 14 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 2,435 vehicles a day, roughly 17% of them trucks, projected to reach 2,435 by 2044. The structure is 163 ft (49.6 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 61 SB
CrossesChalk Ridge RD
Location1.4 Mi. S of Jct. SR J40
RouteU.S. Route 61
StateIowa
Coordinates40.65053, -91.36551
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.6 US tons
Inventory rating41.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length163 ft (49.6 m)
Longest span81 ft (24.8 m)
Deck width45 ft (13.8 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,435 (2022)
Projected traffic2,435 by 2044
Trucks17%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
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 US 61 SB over Chalk Ridge RD built?

It was built in 2011, making it 14 years old in 2025.

What condition is US 61 SB over Chalk Ridge RD 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 January 2024.

How much traffic does US 61 SB over Chalk Ridge RD carry?

About 2,435 vehicles per day (2022 count), of which roughly 17% are trucks.

How long is US 61 SB over Chalk Ridge RD?

The structure is 163 ft (49.6 m) long with a longest span of 81 ft (24.8 m) and a deck 45 ft wide.

Who owns US 61 SB over Chalk Ridge RD?

It is owned by the State Highway Agency.