US Bridges

US 20 EB over Cedar Creek

Good

Sac County, Iowa · 2.5 Mi. E of SR N14 · Structure no. 000000000700100

Built
2012
13 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
306 ft
3 main spans
Daily traffic
2,950
2022 count
Owner
State
State Highway Agency

About this bridge

US 20 EB over Cedar Creek is a prestressed concrete stringer/multi-beam or girder carrying US 20 EB over Cedar Creek in Sac County, Iowa. It was built in 2012, so it is 13 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,950 vehicles a day, roughly 35% of them trucks, projected to reach 2,950 by 2044. The structure is 306 ft (93.3 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 20 EB
CrossesCedar Creek
Location2.5 Mi. E of SR N14
RouteU.S. Route 20
StateIowa
Coordinates42.45294, -94.90608
Functional classRural Principal Arterial - Other

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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than 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

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length306 ft (93.3 m)
Longest span110 ft (33.5 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,950 (2022)
Projected traffic2,950 by 2044
Trucks35%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 20 EB over Cedar Creek built?

It was built in 2012, making it 13 years old in 2025.

What condition is US 20 EB over Cedar 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 2024.

How much traffic does US 20 EB over Cedar Creek carry?

About 2,950 vehicles per day (2022 count), of which roughly 35% are trucks.

How long is US 20 EB over Cedar Creek?

The structure is 306 ft (93.3 m) long with a longest span of 110 ft (33.5 m) and a deck 44 ft wide.

Who owns US 20 EB over Cedar Creek?

It is owned by the State Highway Agency.