US Bridges

SR N18 (t Ave) over Trib W Nodaway River

Good

Montgomery County, Iowa · 071360406 · Structure no. 000000000254162

Built
2011
14 years old
Condition
Good
inspected May 2024
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
40
2022 count
Owner
County
County Highway Agency

About this bridge

SR N18 (t Ave) over Trib W Nodaway River is a concrete continuous culvert carrying SR N18 (t Ave) over Trib W Nodaway River in Montgomery County, Iowa. It was built in 2011, so it is 14 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 40 vehicles a day, projected to reach 40 by 2044. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR N18 (t Ave)
CrossesTrib W Nodaway River
Location071360406
RouteCounty Highway 0
CountyMontgomery County
StateIowa
Coordinates40.97732, -95.00438
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length22 ft (6.7 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 traffic40 (2022)
Projected traffic40 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-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 statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR N18 (t Ave) over Trib W Nodaway River built?

It was built in 2011, making it 14 years old in 2025.

What condition is SR N18 (t Ave) over Trib W Nodaway River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.

How much traffic does SR N18 (t Ave) over Trib W Nodaway River carry?

About 40 vehicles per day (2022 count).

How long is SR N18 (t Ave) over Trib W Nodaway River?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns SR N18 (t Ave) over Trib W Nodaway River?

It is owned by the County Highway Agency.