T55 720th Ave over Miller Creek

Good

Monroe County, Iowa · 073161403 · Structure no. 000000000253231

Built: 2021; 4 years old
Condition: Good; inspected December 2023
Type: Slab; Concrete Continuous
Length: 131 ft; 3 main spans
Daily traffic: 180; 2022 count
Owner: County; County Highway Agency

About this bridge

T55 720th Ave over Miller Creek is a concrete continuous slab carrying T55 720th Ave over Miller Creek in Monroe 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 180 vehicles a day, projected to reach 180 by 2043. The structure is 131 ft (39.9 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesT55 720th Ave

CrossesMiller Creek

Location073161403

RouteCounty Highway 0

CountyMonroe County

StateIowa

Coordinates41.12925, -92.66552

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	7 Good	Some minor problems.

Last inspectionDecember 2023

Inspection intervalevery 48 months

Operating statusOpen, no restriction

ScourFoundations stable; scour within limits of footing or piles

Structural evaluation8: Equal to present desirable criteria

Deck geometry6: Equal to present minimum criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment7: Better than present minimum criteria

Operating rating46.4 US tons

Inventory rating35.7 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHL 93

Structure length131 ft (39.9 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 traffic180 (2022)

Projected traffic180 by 2043

Trucks0%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed3.1 mi (5 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 proposedOther structural work, including hydraulic replacements

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was T55 720th Ave over Miller Creek built?

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

What condition is T55 720th Ave over Miller 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 December 2023.

How much traffic does T55 720th Ave over Miller Creek carry?

About 180 vehicles per day (2022 count).

How long is T55 720th Ave over Miller Creek?

The structure is 131 ft (39.9 m) long with a longest span of 51 ft (15.5 m) and a deck 33 ft wide.

Who owns T55 720th Ave over Miller Creek?

It is owned by the County Highway Agency.