US Bridges

325th ST over Small Stream

PoorClosed to traffic

Story County, Iowa · 082222605 · Structure no. 000000000313850

Built
1905
120 years old, rebuilt 1920
Condition
Poor
inspected January 2023
Type
Culvert
Concrete
Length
45 ft
1 main span
Daily traffic
34
2022 count
Owner
County
County Highway Agency

About this bridge

325th ST over Small Stream is a concrete culvert carrying 325th ST over Small Stream in Story County, Iowa. It was built in 1905 and reconstructed in 1920, so it is 120 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: closed to all traffic.

It carries about 34 vehicles a day, projected to reach 34 by 2043. The structure is 45 ft (13.7 m) long and 18 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries325th ST
CrossesSmall Stream
Location082222605
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates41.88487, -93.38205
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourUnknown foundation; not evaluated for scour
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating0 US tons
Inventory rating0 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length45 ft (13.7 m)
Longest span25 ft (7.6 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34 (2022)
Projected traffic34 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 325th ST over Small Stream built?

It was built in 1905, making it 120 years old in 2025. It was reconstructed in 1920.

What condition is 325th ST over Small Stream 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 January 2023.

How much traffic does 325th ST over Small Stream carry?

About 34 vehicles per day (2022 count).

How long is 325th ST over Small Stream?

The structure is 45 ft (13.7 m) long with a longest span of 25 ft (7.6 m) and a deck 18 ft wide.

Who owns 325th ST over Small Stream?

It is owned by the County Highway Agency.