US Bridges

US 218 over Otter Creek

Fair

Mitchell County, Iowa · 2.6 Mi. N of Jct. SR A19 · Structure no. 000000000036490

Built
1970
55 years old
Condition
Fair
inspected September 2024
Type
Slab
Concrete Continuous
Length
128 ft
3 main spans
Daily traffic
2,530
2022 count
Owner
State
State Highway Agency

About this bridge

US 218 over Otter Creek is a concrete continuous slab carrying US 218 over Otter Creek in Mitchell County, Iowa. It was built in 1970, so it is 55 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 2,530 vehicles a day, roughly 14% of them trucks, projected to reach 2,530 by 2044. The structure is 128 ft (39 m) long and 47 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesUS 218
CrossesOtter Creek
Location2.6 Mi. N of Jct. SR A19
RouteU.S. Route 218
StateIowa
Coordinates43.48735, -92.93826
Functional classRural 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.7 US tons
Inventory rating43 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length128 ft (39 m)
Longest span49 ft (14.9 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,530 (2022)
Projected traffic2,530 by 2044
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 218 over Otter Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is US 218 over Otter 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 September 2024.

How much traffic does US 218 over Otter Creek carry?

About 2,530 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is US 218 over Otter Creek?

The structure is 128 ft (39 m) long with a longest span of 49 ft (14.9 m) and a deck 47 ft wide.

Who owns US 218 over Otter Creek?

It is owned by the State Highway Agency.