US Bridges

G64 over I-35

Fair

Warren County, Iowa · 3.6 Miles North of SR G76 · Structure no. 000000000051200

Built
1958
67 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
201 ft
4 main spans
Daily traffic
649
2022 count
Owner
State
State Highway Agency

About this bridge

G64 over I-35 is a prestressed concrete stringer/multi-beam or girder carrying G64 over I-35 in Warren County, Iowa. It was built in 1958, so it is 67 years old, older than the Iowa average of 45.5 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 649 vehicles a day, roughly 5% of them trucks, projected to reach 649 by 2043. The structure is 201 ft (61.3 m) long and 34 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesG64
CrossesI-35
Location3.6 Miles North of SR G76
RouteCounty Highway 0
CountyWarren County
StateIowa
Coordinates41.22784, -93.78176
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
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
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating24.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length201 ft (61.3 m)
Longest span56 ft (17.1 m)
Deck width34 ft (10.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic649 (2022)
Projected traffic649 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed9.9 mi (16 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 G64 over I-35 built?

It was built in 1958, making it 67 years old in 2025.

What condition is G64 over I-35 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 March 2023.

How much traffic does G64 over I-35 carry?

About 649 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is G64 over I-35?

The structure is 201 ft (61.3 m) long with a longest span of 56 ft (17.1 m) and a deck 34 ft wide.

Who owns G64 over I-35?

It is owned by the State Highway Agency.