US Bridges

Ia 330 over Linn Creek

Fair

Marshall County, Iowa · 1.8 Miles N of Jct. US 30 · Structure no. 000000000242530

Built
1964
61 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
154 ft
3 main spans
Daily traffic
2,390
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 330 over Linn Creek is a steel continuous stringer/multi-beam or girder carrying Ia 330 over Linn Creek in Marshall County, Iowa. It was built in 1964, so it is 61 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 2,390 vehicles a day, roughly 12% of them trucks, projected to reach 2,390 by 2044. The structure is 154 ft (46.9 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesIa 330
CrossesLinn Creek
Location1.8 Miles N of Jct. US 30
RouteState Highway 330
CountyMarshall County
StateIowa
Coordinates42.02799, -92.99999
Functional classRural Principal Arterial - Other

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating56.2 US tons
Inventory rating33.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length154 ft (46.9 m)
Longest span59 ft (18 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,390 (2022)
Projected traffic2,390 by 2044
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ia 330 over Linn Creek built?

It was built in 1964, making it 61 years old in 2025.

What condition is Ia 330 over Linn Creek 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 November 2024.

How much traffic does Ia 330 over Linn Creek carry?

About 2,390 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is Ia 330 over Linn Creek?

The structure is 154 ft (46.9 m) long with a longest span of 59 ft (18 m) and a deck 30 ft wide.

Who owns Ia 330 over Linn Creek?

It is owned by the State Highway Agency.