US Bridges

HWY 66 over Small Natural Stream

Poor

Ringgold County, Iowa · 068300506 · Structure no. 000000000046500

Built
1935
90 years old, rebuilt 1969
Condition
Poor
inspected December 2022
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
737
2022 count
Owner
County
County Highway Agency

About this bridge

HWY 66 over Small Natural Stream is a concrete continuous culvert carrying HWY 66 over Small Natural Stream in Ringgold County, Iowa. It was built in 1935 and reconstructed in 1969, so it is 90 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 737 vehicles a day, roughly 10% of them trucks, projected to reach 737 by 2043. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesHWY 66
CrossesSmall Natural Stream
Location068300506
RouteCounty Highway 0
CountyRinggold County
StateIowa
Coordinates40.72146, -94.32873
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 inspectionDecember 2022
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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating78.3 US tons
Inventory rating16.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic737 (2022)
Projected traffic737 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 HWY 66 over Small Natural Stream built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1969.

What condition is HWY 66 over Small Natural 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 December 2022.

How much traffic does HWY 66 over Small Natural Stream carry?

About 737 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is HWY 66 over Small Natural Stream?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns HWY 66 over Small Natural Stream?

It is owned by the County Highway Agency.