X6A Mays Prairie over French Creek

Good

Allamakee County, Iowa · 099051106 · Structure no. 000000000062762

Built: 2018; 7 years old
Condition: Good; inspected April 2022
Type: Slab; Concrete Continuous
Length: 133 ft; 3 main spans
Daily traffic: 137; 2022 count
Owner: County; County Highway Agency

About this bridge

X6A Mays Prairie over French Creek is a concrete continuous slab carrying X6A Mays Prairie over French Creek in Allamakee County, Iowa. It was built in 2018, so it is 7 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 137 vehicles a day, projected to reach 137 by 2042. The structure is 133 ft (40.5 m) long and 33 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesX6A Mays Prairie

CrossesFrench Creek

Location099051106

RouteCounty Highway 0

CountyAllamakee County

StateIowa

Coordinates43.40785, -91.39874

Functional classRural Minor Collector

Condition and inspection

Good

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

Component	Rating	Meaning
Deck	8 Very Good	No problems noted.
Superstructure	8 Very Good	No problems noted.
Substructure	8 Very Good	No problems noted.
Channel and channel protection	8 Very Good	No problems noted.

Last inspectionApril 2022

Inspection intervalevery 48 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 rating59.3 US tons

Inventory rating45.7 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHL 93

Structure length133 ft (40.5 m)

Longest span51 ft (15.5 m)

Deck width33 ft (10.1 m)

Roadway width31 ft (9.3 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic137 (2022)

Projected traffic137 by 2042

Trucks0%

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

OwnerCounty Highway Agency

Maintained byCounty 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 X6A Mays Prairie over French Creek built?

It was built in 2018, making it 7 years old in 2025.

What condition is X6A Mays Prairie over French 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 2022.

How much traffic does X6A Mays Prairie over French Creek carry?

About 137 vehicles per day (2022 count).

How long is X6A Mays Prairie over French Creek?

The structure is 133 ft (40.5 m) long with a longest span of 51 ft (15.5 m) and a deck 33 ft wide.

Who owns X6A Mays Prairie over French Creek?

It is owned by the County Highway Agency.