US Bridges

198th ST over Small Creek

PoorPosted for load

Harrison County, Iowa · 080422211 · Structure no. 000000000178670

Built
1950
75 years old
Condition
Poor
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
84 ft
1 main span
Daily traffic
79
2022 count
Owner
County
County Highway Agency

About this bridge

198th ST over Small Creek is a steel stringer/multi-beam or girder carrying 198th ST over Small Creek in Harrison County, Iowa. It was built in 1950, so it is 75 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 4 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 79 vehicles a day, projected to reach 79 by 2044. The structure is 84 ft (25.6 m) long and 16 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries198th ST
CrossesSmall Creek
Location080422211
RouteCounty Highway 0
StateIowa
Coordinates41.7219, -95.71607
Functional classRural Local

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating27 US tons
Inventory rating19.8 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1 (+1 approach)
Design loadHS 20
Structure length84 ft (25.6 m)
Longest span58 ft (17.7 m)
Deck width16 ft (5 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic79 (2022)
Projected traffic79 by 2044
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 198th ST over Small Creek built?

It was built in 1950, making it 75 years old in 2025.

What condition is 198th ST over Small Creek 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 November 2024.

How much traffic does 198th ST over Small Creek carry?

About 79 vehicles per day (2022 count).

How long is 198th ST over Small Creek?

The structure is 84 ft (25.6 m) long with a longest span of 58 ft (17.7 m) and a deck 16 ft wide.

Who owns 198th ST over Small Creek?

It is owned by the County Highway Agency.