US Bridges

Chestnut Road over Graybill Creek

Good

Pottawattamie County, Iowa · 074401301 · Structure no. 000000000284071

Built
1997
28 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
192 ft
3 main spans
Daily traffic
45
2022 count
Owner
County
County Highway Agency

About this bridge

Chestnut Road over Graybill Creek is a prestressed concrete stringer/multi-beam or girder carrying Chestnut Road over Graybill Creek in Pottawattamie County, Iowa. It was built in 1997, so it is 28 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 45 vehicles a day, projected to reach 45 by 2043. The structure is 192 ft (58.5 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesChestnut Road
CrossesGraybill Creek
Location074401301
RouteCounty Highway 0
CountyPottawattamie County
StateIowa
Coordinates41.21808, -95.3906
Functional classRural Local

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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.8 US tons
Inventory rating40.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length192 ft (58.5 m)
Longest span68 ft (20.7 m)
Deck width27 ft (8.3 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2022)
Projected traffic45 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Chestnut Road over Graybill Creek built?

It was built in 1997, making it 28 years old in 2025.

What condition is Chestnut Road over Graybill 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 July 2023.

How much traffic does Chestnut Road over Graybill Creek carry?

About 45 vehicles per day (2022 count).

How long is Chestnut Road over Graybill Creek?

The structure is 192 ft (58.5 m) long with a longest span of 68 ft (20.7 m) and a deck 27 ft wide.

Who owns Chestnut Road over Graybill Creek?

It is owned by the County Highway Agency.