US Bridges

H20 (150th St) over Nishnabotna River

Good

Montgomery County, Iowa · 073383403 · Structure no. 000000000256671

Built
2013
12 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
312 ft
3 main spans
Daily traffic
159
2021 count
Owner
County
County Highway Agency

About this bridge

H20 (150th St) over Nishnabotna River is a prestressed concrete stringer/multi-beam or girder carrying H20 (150th St) over Nishnabotna River in Montgomery County, Iowa. It was built in 2013, so it is 12 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 159 vehicles a day, roughly 32% of them trucks, projected to reach 159 by 2043. The structure is 312 ft (95.1 m) long and 33 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesH20 (150th St)
CrossesNishnabotna River
Location073383403
RouteCounty Highway 0
CountyMontgomery County
StateIowa
Coordinates41.08744, -95.20568
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length312 ft (95.1 m)
Longest span107 ft (32.6 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic159 (2021)
Projected traffic159 by 2043
Trucks32%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 H20 (150th St) over Nishnabotna River built?

It was built in 2013, making it 12 years old in 2025.

What condition is H20 (150th St) over Nishnabotna 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 2023.

How much traffic does H20 (150th St) over Nishnabotna River carry?

About 159 vehicles per day (2021 count), of which roughly 32% are trucks.

How long is H20 (150th St) over Nishnabotna River?

The structure is 312 ft (95.1 m) long with a longest span of 107 ft (32.6 m) and a deck 33 ft wide.

Who owns H20 (150th St) over Nishnabotna River?

It is owned by the County Highway Agency.