US Bridges

Ia 64 over Grants Creek

Good

Jackson County, Iowa · 0.8 Mi. E of E JCT SR Z34 · Structure no. 000000000030351

Built
1984
41 years old
Condition
Good
inspected February 2023
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
1,890
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 64 over Grants Creek is a concrete continuous culvert carrying Ia 64 over Grants Creek in Jackson County, Iowa. It was built in 1984, so it is 41 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 1,890 vehicles a day, roughly 13% of them trucks, projected to reach 1,890 by 2042. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesIa 64
CrossesGrants Creek
Location0.8 Mi. E of E JCT SR Z34
RouteState Highway 64
CountyJackson County
StateIowa
Coordinates42.05238, -90.37862
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating37.1 US tons
Inventory rating28.5 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,890 (2022)
Projected traffic1,890 by 2042
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ia 64 over Grants Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is Ia 64 over Grants Creek 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 February 2023.

How much traffic does Ia 64 over Grants Creek carry?

About 1,890 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is Ia 64 over Grants Creek?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m).

Who owns Ia 64 over Grants Creek?

It is owned by the State Highway Agency.