70th Ave over Creek

Fair

Scott County, Iowa · 080E21702 · Structure no. 000000000303260

Built: 1968; 57 years old
Condition: Fair; inspected April 2023
Type: Slab; Concrete Continuous
Length: 104 ft; 3 main spans
Daily traffic: 26; 2022 count
Owner: County; County Highway Agency

About this bridge

70th Ave over Creek is a concrete continuous slab carrying 70th Ave over Creek in Scott County, Iowa. It was built in 1968, so it is 57 years old, older 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 26 vehicles a day, projected to reach 26 by 2043. The structure is 104 ft (31.7 m) long and 30 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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Carries70th Ave

CrossesCreek

Location080E21702

RouteCounty Highway 0

CountyScott County

StateIowa

Coordinates41.73836, -90.76276

Functional classRural Local

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	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry7: Better than present minimum criteria

Waterway adequacy7: Better than present minimum criteria

Approach roadway alignment7: Better than present minimum criteria

Operating rating55.3 US tons

Inventory rating33.7 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadH 20

Structure length104 ft (31.7 m)

Longest span39 ft (11.9 m)

Deck width30 ft (9.1 m)

Roadway width28 ft (8.5 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2022)

Projected traffic26 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was 70th Ave over Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is 70th Ave over 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 70th Ave over Creek carry?

About 26 vehicles per day (2022 count).

How long is 70th Ave over Creek?

The structure is 104 ft (31.7 m) long with a longest span of 39 ft (11.9 m) and a deck 30 ft wide.

Who owns 70th Ave over Creek?

It is owned by the County Highway Agency.