US Bridges

B25 Chestnut ST over Cota Creek

Good

Allamakee County, Iowa · 0.1 MI W Great River RD · Structure no. 000000000005971

Built
2021
4 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
110 ft
1 main span
Daily traffic
420
2022 count
Owner
County
County Highway Agency

About this bridge

B25 Chestnut ST over Cota Creek is a prestressed concrete stringer/multi-beam or girder carrying B25 Chestnut ST over Cota Creek in Allamakee County, Iowa. It was built in 2021, so it is 4 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 420 vehicles a day, roughly 20% of them trucks, projected to reach 420 by 2044. The structure is 110 ft (33.5 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesB25 Chestnut ST
CrossesCota Creek
Location0.1 MI W Great River RD
RouteCity Street 0
StateIowa
Coordinates43.20244, -91.15618
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.1 US tons
Inventory rating46.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length110 ft (33.5 m)
Longest span110 ft (33.5 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic420 (2022)
Projected traffic420 by 2044
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 B25 Chestnut ST over Cota Creek built?

It was built in 2021, making it 4 years old in 2025.

What condition is B25 Chestnut ST over Cota 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 April 2024.

How much traffic does B25 Chestnut ST over Cota Creek carry?

About 420 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is B25 Chestnut ST over Cota Creek?

The structure is 110 ft (33.5 m) long with a longest span of 110 ft (33.5 m) and a deck 33 ft wide.

Who owns B25 Chestnut ST over Cota Creek?

It is owned by the County Highway Agency.