US Bridges

Lakeport ST over US 20

Fair

Woodbury County, Iowa · 1.5 Mi. E of Jct. I-29 · Structure no. 000000000603710

Built
1978
47 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
270 ft
4 main spans
Daily traffic
9,850
2022 count
Owner
State
State Highway Agency

About this bridge

Lakeport ST over US 20 is a prestressed concrete stringer/multi-beam or girder carrying Lakeport ST over US 20 in Woodbury County, Iowa. It was built in 1978, so it is 47 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 9,850 vehicles a day, roughly 2% of them trucks, projected to reach 9,850 by 2043. The structure is 270 ft (82.3 m) long and 79 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesLakeport ST
CrossesUS 20
Location1.5 Mi. E of Jct. I-29
RouteCity Street 0
CountyWoodbury County
StateIowa
Coordinates42.44336, -96.34717
Functional classUrban Minor Arterial

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating62.5 US tons
Inventory rating10 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length270 ft (82.3 m)
Longest span92 ft (28 m)
Deck width79 ft (24 m)
Roadway width70 ft (21.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,850 (2022)
Projected traffic9,850 by 2043
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.9 mi (3 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 Lakeport ST over US 20 built?

It was built in 1978, making it 47 years old in 2025.

What condition is Lakeport ST over US 20 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 September 2023.

How much traffic does Lakeport ST over US 20 carry?

About 9,850 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Lakeport ST over US 20?

The structure is 270 ft (82.3 m) long with a longest span of 92 ft (28 m) and a deck 79 ft wide.

Who owns Lakeport ST over US 20?

It is owned by the State Highway Agency.