Larch Ave over Overflow Otter Creek

Good

Lyon County, Iowa · 098433302 · Structure no. 000000000228181

Built: 2022; 3 years old
Condition: Good; inspected July 2023
Type: Slab; Concrete Continuous
Length: 71 ft; 3 main spans
Daily traffic: 30; 2022 count
Owner: County; County Highway Agency

About this bridge

Larch Ave over Overflow Otter Creek is a concrete continuous slab carrying Larch Ave over Overflow Otter Creek in Lyon County, Iowa. It was built in 2022, so it is 3 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 30 vehicles a day, projected to reach 30 by 2043. The structure is 71 ft (21.6 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesLarch Ave

CrossesOverflow Otter Creek

Location098433302

RouteCounty Highway 0

CountyLyon County

StateIowa

Coordinates43.26609, -95.94131

Functional classRural Local

Condition and inspection

Good

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

Component	Rating	Meaning
Deck	9 Excellent	No problems noted.
Superstructure	9 Excellent	No problems noted.
Substructure	9 Excellent	No problems noted.
Channel and channel protection	8 Very Good	No problems noted.

Last inspectionJuly 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour within limits of footing or piles

Structural evaluation9: Superior to present desirable criteria

Deck geometry7: Better than present minimum criteria

Waterway adequacy7: Better than present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating59 US tons

Inventory rating45.3 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHL 93

Structure length71 ft (21.6 m)

Longest span28 ft (8.5 m)

Deck width33 ft (10.1 m)

Roadway width31 ft (9.3 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2022)

Projected traffic30 by 2043

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$30,000 (2024 estimate)

NavigationNo navigation control on waterway

Frequently asked questions

When was Larch Ave over Overflow Otter Creek built?

It was built in 2022, making it 3 years old in 2025.

What condition is Larch Ave over Overflow Otter 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 July 2023.

How much traffic does Larch Ave over Overflow Otter Creek carry?

About 30 vehicles per day (2022 count).

How long is Larch Ave over Overflow Otter Creek?

The structure is 71 ft (21.6 m) long with a longest span of 28 ft (8.5 m) and a deck 33 ft wide.

Who owns Larch Ave over Overflow Otter Creek?

It is owned by the County Highway Agency.