US Bridges

N18 330th Ave over Pool-Mud Lake

Good

Clay County, Iowa · 097352502 · Structure no. 000000000117261

Built
2018
7 years old
Condition
Good
inspected March 2021
Type
Culvert
Concrete
Length
30 ft
1 main span
Daily traffic
350
2022 count
Owner
County
County Highway Agency

About this bridge

N18 330th Ave over Pool-Mud Lake is a concrete culvert carrying N18 330th Ave over Pool-Mud Lake in Clay County, Iowa. It was built in 2018, so it is 7 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 350 vehicles a day, projected to reach 350 by 2043. The structure is 30 ft (9.1 m) long. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesN18 330th Ave
CrossesPool-Mud Lake
Location097352502
RouteCounty Highway 0
CountyClay County
StateIowa
Coordinates43.18536, -94.92591
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionMarch 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating53.6 US tons
Inventory rating42.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHL 93
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2022)
Projected traffic350 by 2043
Trucks0%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was N18 330th Ave over Pool-Mud Lake built?

It was built in 2018, making it 7 years old in 2025.

What condition is N18 330th Ave over Pool-Mud Lake 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 March 2021.

How much traffic does N18 330th Ave over Pool-Mud Lake carry?

About 350 vehicles per day (2022 count).

How long is N18 330th Ave over Pool-Mud Lake?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m).

Who owns N18 330th Ave over Pool-Mud Lake?

It is owned by the County Highway Agency.