Allens Grove RD over Mud Creek

Fair

Scott County, Iowa · 080E22903 · Structure no. 000000000303311

Built: 1987; 38 years old
Condition: Fair; inspected April 2023
Type: Slab; Concrete Continuous
Length: 181 ft; 5 main spans
Daily traffic: 550; 2021 count
Owner: County; County Highway Agency

About this bridge

Allens Grove RD over Mud Creek is a concrete continuous slab carrying Allens Grove RD over Mud Creek in Scott County, Iowa. It was built in 1987, so it is 38 years old, younger 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 550 vehicles a day, roughly 22% of them trucks, projected to reach 550 by 2043. The structure is 181 ft (55.2 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesAllens Grove RD

CrossesMud Creek

Location080E22903

RouteCounty Highway 0

CountyScott County

StateIowa

Coordinates41.71147, -90.7434

Functional classRural Minor Collector

Condition and inspection

Fair

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

Component	Rating	Meaning
Deck	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure	6 Satisfactory	Structural elements show some minor deterioration.
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionApril 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is

Deck geometry6: Equal to present minimum criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment6: Equal to present minimum criteria

Operating rating69.1 US tons

Inventory rating41.4 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans5

Design loadHS 20

Structure length181 ft (55.2 m)

Longest span39 ft (11.9 m)

Deck width33 ft (10.1 m)

Roadway width30 ft (9.1 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic550 (2021)

Projected traffic550 by 2043

Trucks22%

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 statusPossibly eligible for the National Register; requires further investigation

Work proposedReplacement because of substandard load-carrying capacity or roadway geometry

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was Allens Grove RD over Mud Creek built?

It was built in 1987, making it 38 years old in 2025.

What condition is Allens Grove RD over Mud Creek 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 April 2023.

How much traffic does Allens Grove RD over Mud Creek carry?

About 550 vehicles per day (2021 count), of which roughly 22% are trucks.

How long is Allens Grove RD over Mud Creek?

The structure is 181 ft (55.2 m) long with a longest span of 39 ft (11.9 m) and a deck 33 ft wide.

Who owns Allens Grove RD over Mud Creek?

It is owned by the County Highway Agency.