US Bridges

Ia 31 over Stratton Creek

Fair

Cherokee County, Iowa · 0.1 Mi. N of SR C66 · Structure no. 000000000019490

Built
1922
103 years old, rebuilt 1950
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
44 ft
1 main span
Daily traffic
1,330
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 31 over Stratton Creek is a steel stringer/multi-beam or girder carrying Ia 31 over Stratton Creek in Cherokee County, Iowa. It was built in 1922 and reconstructed in 1950, so it is 103 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 1,330 vehicles a day, roughly 20% of them trucks, projected to reach 1,330 by 2044. The structure is 44 ft (13.4 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesIa 31
CrossesStratton Creek
Location0.1 Mi. N of SR C66
RouteState Highway 31
CountyCherokee County
StateIowa
Coordinates42.57709, -95.71467
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.9 US tons
Inventory rating24.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length44 ft (13.4 m)
Longest span41 ft (12.5 m)
Deck width35 ft (10.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,330 (2022)
Projected traffic1,330 by 2044
Trucks20%
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

OwnerState Highway Agency
Maintained byState 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 Ia 31 over Stratton Creek built?

It was built in 1922, making it 103 years old in 2025. It was reconstructed in 1950.

What condition is Ia 31 over Stratton 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 November 2024.

How much traffic does Ia 31 over Stratton Creek carry?

About 1,330 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is Ia 31 over Stratton Creek?

The structure is 44 ft (13.4 m) long with a longest span of 41 ft (12.5 m) and a deck 35 ft wide.

Who owns Ia 31 over Stratton Creek?

It is owned by the State Highway Agency.