US Bridges

Ia 183 over Natural Stream

Good

Monona County, Iowa · 3.5 Mi. S of Co. Rd. E-54 · Structure no. 000000000037131

Built
2015
10 years old
Condition
Good
inspected June 2023
Type
Slab
Concrete
Length
131 ft
3 main spans
Daily traffic
580
2021 count
Owner
State
State Highway Agency

About this bridge

Ia 183 over Natural Stream is a concrete slab carrying Ia 183 over Natural Stream in Monona County, Iowa. It was built in 2015, so it is 10 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 580 vehicles a day, roughly 17% of them trucks, projected to reach 580 by 2043. The structure is 131 ft (39.9 m) long and 43 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

Location

Open in Google Maps
CarriesIa 183
CrossesNatural Stream
Location3.5 Mi. S of Co. Rd. E-54
RouteState Highway 183
CountyMonona County
StateIowa
Coordinates41.8859, -95.89346
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length131 ft (39.9 m)
Longest span51 ft (15.5 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic580 (2021)
Projected traffic580 by 2043
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.8 mi (64 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 183 over Natural Stream built?

It was built in 2015, making it 10 years old in 2025.

What condition is Ia 183 over Natural Stream 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 June 2023.

How much traffic does Ia 183 over Natural Stream carry?

About 580 vehicles per day (2021 count), of which roughly 17% are trucks.

How long is Ia 183 over Natural Stream?

The structure is 131 ft (39.9 m) long with a longest span of 51 ft (15.5 m) and a deck 43 ft wide.

Who owns Ia 183 over Natural Stream?

It is owned by the State Highway Agency.