US Bridges

S Dakota R38 SB over US 30

Good

Story County, Iowa · At Junction SR R38 · Structure no. 000000000504465

Built
2001
24 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
282 ft
4 main spans
Daily traffic
6,881
2022 count
Owner
State
State Highway Agency

About this bridge

S Dakota R38 SB over US 30 is a prestressed concrete stringer/multi-beam or girder carrying S Dakota R38 SB over US 30 in Story County, Iowa. It was built in 2001, so it is 24 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 6,881 vehicles a day, roughly 2% of them trucks, projected to reach 6,881 by 2044. The structure is 282 ft (86 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesS Dakota R38 SB
CrossesUS 30
LocationAt Junction SR R38
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates42.00891, -93.67876
Functional classUrban 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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96.5 US tons
Inventory rating55.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length282 ft (86 m)
Longest span97 ft (29.6 m)
Deck width45 ft (13.8 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,881 (2022)
Projected traffic6,881 by 2044
Trucks2%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was S Dakota R38 SB over US 30 built?

It was built in 2001, making it 24 years old in 2025.

What condition is S Dakota R38 SB over US 30 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 April 2024.

How much traffic does S Dakota R38 SB over US 30 carry?

About 6,881 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is S Dakota R38 SB over US 30?

The structure is 282 ft (86 m) long with a longest span of 97 ft (29.6 m) and a deck 45 ft wide.

Who owns S Dakota R38 SB over US 30?

It is owned by the State Highway Agency.