US Bridges

SR P-48 over I-80

Fair

Madison County, Iowa · At Jct. of SR P48 · Structure no. 000000000034830

Built
1959
66 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
219 ft
4 main spans
Daily traffic
229
2022 count
Owner
State
State Highway Agency

About this bridge

SR P-48 over I-80 is a prestressed concrete stringer/multi-beam or girder carrying SR P-48 over I-80 in Madison County, Iowa. It was built in 1959, so it is 66 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 5 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 229 vehicles a day, roughly 6% of them trucks, projected to reach 229 by 2044. The structure is 219 ft (66.8 m) long and 34 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesSR P-48
CrossesI-80
LocationAt Jct. of SR P48
RouteCounty Highway 0
CountyMadison County
StateIowa
Coordinates41.4931, -94.24158
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating73.5 US tons
Inventory rating33.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length219 ft (66.8 m)
Longest span65 ft (19.8 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic229 (2022)
Projected traffic229 by 2044
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed8.1 mi (13 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 SR P-48 over I-80 built?

It was built in 1959, making it 66 years old in 2025.

What condition is SR P-48 over I-80 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 April 2024.

How much traffic does SR P-48 over I-80 carry?

About 229 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is SR P-48 over I-80?

The structure is 219 ft (66.8 m) long with a longest span of 65 ft (19.8 m) and a deck 34 ft wide.

Who owns SR P-48 over I-80?

It is owned by the State Highway Agency.