US Bridges

CO RD R 61 over U.S. 20

Good

Hamilton County, Iowa · 0.5 Mile East of JCT I-35 · Structure no. 000000000606180

Built
1990
35 years old
Condition
Good
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
253 ft
4 main spans
Daily traffic
159
2022 count
Owner
State
State Highway Agency

About this bridge

CO RD R 61 over U.S. 20 is a prestressed concrete stringer/multi-beam or girder carrying CO RD R 61 over U.S. 20 in Hamilton County, Iowa. It was built in 1990, so it is 35 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 159 vehicles a day, roughly 23% of them trucks, projected to reach 159 by 2044. The structure is 253 ft (77.1 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesCO RD R 61
CrossesU.S. 20
Location0.5 Mile East of JCT I-35
RouteCounty Highway 0
StateIowa
Coordinates42.44843, -93.56012
Functional classRural Major Collector

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.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating99.8 US tons
Inventory rating38 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length253 ft (77.1 m)
Longest span82 ft (25 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic159 (2022)
Projected traffic159 by 2044
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

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 CO RD R 61 over U.S. 20 built?

It was built in 1990, making it 35 years old in 2025.

What condition is CO RD R 61 over U.S. 20 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 March 2024.

How much traffic does CO RD R 61 over U.S. 20 carry?

About 159 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is CO RD R 61 over U.S. 20?

The structure is 253 ft (77.1 m) long with a longest span of 82 ft (25 m) and a deck 33 ft wide.

Who owns CO RD R 61 over U.S. 20?

It is owned by the State Highway Agency.