US Bridges

C56 590th ST over Lizard Creek

Good

Pocahontas County, Iowa · 090320801 · Structure no. 000000000040341

Built
2015
10 years old
Condition
Good
inspected November 2021
Type
Slab
Concrete Continuous
Length
140 ft
3 main spans
Daily traffic
240
2022 count
Owner
County
County Highway Agency

About this bridge

C56 590th ST over Lizard Creek is a concrete continuous slab carrying C56 590th ST over Lizard Creek in Pocahontas County, Iowa. It was built in 2015, so it is 10 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 240 vehicles a day, roughly 25% of them trucks, projected to reach 240 by 2043. The structure is 140 ft (42.7 m) long and 33 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesC56 590th ST
CrossesLizard Creek
Location090320801
RouteCounty Highway 0
StateIowa
Coordinates42.63173, -94.6556
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 inspectionNovember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length140 ft (42.7 m)
Longest span55 ft (16.8 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic240 (2022)
Projected traffic240 by 2043
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 C56 590th ST over Lizard Creek built?

It was built in 2015, making it 10 years old in 2025.

What condition is C56 590th ST over Lizard Creek 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 November 2021.

How much traffic does C56 590th ST over Lizard Creek carry?

About 240 vehicles per day (2022 count), of which roughly 25% are trucks.

How long is C56 590th ST over Lizard Creek?

The structure is 140 ft (42.7 m) long with a longest span of 55 ft (16.8 m) and a deck 33 ft wide.

Who owns C56 590th ST over Lizard Creek?

It is owned by the County Highway Agency.