US Bridges

Prentiss ST over Ralston Creek

Good

Johnson County, Iowa · 079061500 · Structure no. 000000000500791

Built
2020
5 years old
Condition
Good
inspected July 2023
Type
Culvert
Concrete Continuous
Length
40 ft
3 main spans
Daily traffic
1,664
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Prentiss ST over Ralston Creek is a concrete continuous culvert carrying Prentiss ST over Ralston Creek in Johnson County, Iowa. It was built in 2020, so it is 5 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 1,664 vehicles a day, projected to reach 1,664 by 2043. The structure is 40 ft (12.3 m) long and 66 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesPrentiss ST
CrossesRalston Creek
Location079061500
RouteCity Street 0
CountyJohnson County
StateIowa
Coordinates41.65439, -91.53168
Functional classUrban Local

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 protection7 GoodSome minor problems.
Culvert8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHL 93
Structure length40 ft (12.3 m)
Longest span13 ft (4 m)
Deck width66 ft (20.2 m)
Roadway width64 ft (19.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,664 (2022)
Projected traffic1,664 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Prentiss ST over Ralston Creek built?

It was built in 2020, making it 5 years old in 2025.

What condition is Prentiss ST over Ralston 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 Prentiss ST over Ralston Creek carry?

About 1,664 vehicles per day (2022 count).

How long is Prentiss ST over Ralston Creek?

The structure is 40 ft (12.3 m) long with a longest span of 13 ft (4 m) and a deck 66 ft wide.

Who owns Prentiss ST over Ralston Creek?

It is owned by the City or Municipal Highway Agency.