US Bridges

North Main ST over Small Stream

Poor

Tama County, Iowa · 083162107 · Structure no. 000000000049710

Built
1962
63 years old
Condition
Poor
inspected October 2024
Type
Culvert
Concrete Continuous
Length
51 ft
3 main spans
Daily traffic
869
2022 count
Owner
County
County Highway Agency

About this bridge

North Main ST over Small Stream is a concrete continuous culvert carrying North Main ST over Small Stream in Tama County, Iowa. It was built in 1962, so it is 63 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.

It carries about 869 vehicles a day, projected to reach 869 by 2044. The structure is 51 ft (15.5 m) long. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesNorth Main ST
CrossesSmall Stream
Location083162107
RouteCity Street 0
CountyTama County
StateIowa
Coordinates41.9831, -92.71507
Functional classRural Major Collector

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 inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span18 ft (5.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic869 (2022)
Projected traffic869 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was North Main ST over Small Stream built?

It was built in 1962, making it 63 years old in 2025.

What condition is North Main 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 October 2024.

How much traffic does North Main ST over Small Stream carry?

About 869 vehicles per day (2022 count).

How long is North Main ST over Small Stream?

The structure is 51 ft (15.5 m) long with a longest span of 18 ft (5.5 m).

Who owns North Main ST over Small Stream?

It is owned by the County Highway Agency.