US Bridges

225 ST over I029

Fair

Moody County, South Dakota · 5 S Brookings CO Line · Structure no. 000000051065050

Built
1966
59 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
254 ft
4 main spans
Daily traffic
69
2023 count
Owner
State
State Highway Agency

About this bridge

225 ST over I029 is a prestressed concrete continuous stringer/multi-beam or girder carrying 225 ST over I029 in Moody County, South Dakota. It was built in 1966, so it is 59 years old, older than the South Dakota average of 48.9 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 69 vehicles a day, roughly 2% of them trucks, projected to reach 69 by 2043. The structure is 254 ft (77.4 m) long and 30 ft wide. If it were closed, the detour would be 31.1 mi (50 km).

Carries225 ST
CrossesI029
Location5 S Brookings CO Line
RouteCounty Highway 0
Coordinates44.12345, -96.75871
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.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46.1 US tons
Inventory rating27.6 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length254 ft (77.4 m)
Longest span70 ft (21.3 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic69 (2023)
Projected traffic69 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed31.1 mi (50 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 225 ST over I029 built?

It was built in 1966, making it 59 years old in 2025.

What condition is 225 ST over I029 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 February 2024.

How much traffic does 225 ST over I029 carry?

About 69 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is 225 ST over I029?

The structure is 254 ft (77.4 m) long with a longest span of 70 ft (21.3 m) and a deck 30 ft wide.

Who owns 225 ST over I029?

It is owned by the State Highway Agency.