US Bridges

So Center ST over RR and Madison ST

PoorPosted for load

Marshall County, Iowa · 084183504 · Structure no. 000000000035410

Built
1951
74 years old
Condition
Poor
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,604 ft
20 main spans
Daily traffic
9,491
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

So Center ST over RR and Madison ST is a steel continuous stringer/multi-beam or girder carrying So Center ST over RR and Madison ST in Marshall County, Iowa. It was built in 1951, so it is 74 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 9,491 vehicles a day, projected to reach 9,491 by 2044. The structure is 1,604 ft (488.9 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSo Center ST
CrossesRR and Madison ST
Location084183504
RouteCity Street 0
CountyMarshall County
StateIowa
Coordinates42.04064, -92.91283
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating44.3 US tons
Inventory rating27.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans20
Design loadH 20
Structure length1,604 ft (488.9 m)
Longest span113 ft (34.4 m)
Deck width48 ft (14.7 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,491 (2022)
Projected traffic9,491 by 2044
Trucks0%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$6 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was So Center ST over RR and Madison ST built?

It was built in 1951, making it 74 years old in 2025.

What condition is So Center ST over RR and Madison ST in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does So Center ST over RR and Madison ST carry?

About 9,491 vehicles per day (2022 count).

How long is So Center ST over RR and Madison ST?

The structure is 1,604 ft (488.9 m) long with a longest span of 113 ft (34.4 m) and a deck 48 ft wide.

Who owns So Center ST over RR and Madison ST?

It is owned by the City or Municipal Highway Agency.