US Bridges

Ia 31 over Stream

Fair

Woodbury County, Iowa · 1.9 Mi. N of SR D30 · Structure no. 000000000053150

Built
1956
69 years old
Condition
Fair
inspected November 2023
Type
Slab
Concrete Continuous
Length
102 ft
3 main spans
Daily traffic
1,070
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 31 over Stream is a concrete continuous slab carrying Ia 31 over Stream in Woodbury County, Iowa. It was built in 1956, so it is 69 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 6 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 1,070 vehicles a day, roughly 20% of them trucks, projected to reach 1,070 by 2043. The structure is 102 ft (31.1 m) long and 35 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesIa 31
CrossesStream
Location1.9 Mi. N of SR D30
RouteState Highway 31
CountyWoodbury County
StateIowa
Coordinates42.42296, -95.85052
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length102 ft (31.1 m)
Longest span38 ft (11.6 m)
Deck width35 ft (10.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,070 (2022)
Projected traffic1,070 by 2043
Trucks20%
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

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 Stream built?

It was built in 1956, making it 69 years old in 2025.

What condition is Ia 31 over Stream 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 2023.

How much traffic does Ia 31 over Stream carry?

About 1,070 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is Ia 31 over Stream?

The structure is 102 ft (31.1 m) long with a longest span of 38 ft (11.6 m) and a deck 35 ft wide.

Who owns Ia 31 over Stream?

It is owned by the State Highway Agency.