US Bridges

137th ST over Small Stream

Good

Delaware County, Iowa · 900422 4580 · Structure no. 000000000142381

Built
2015
10 years old
Condition
Good
inspected October 2024
Type
Slab
Concrete Continuous
Length
83 ft
3 main spans
Daily traffic
44
2022 count
Owner
County
County Highway Agency

About this bridge

137th ST over Small Stream is a concrete continuous slab carrying 137th ST over Small Stream in Delaware 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 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 44 vehicles a day, projected to reach 44 by 2044. The structure is 83 ft (25.3 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries137th ST
CrossesSmall Stream
Location900422 4580
RouteCounty Highway 0
CountyDelaware County
StateIowa
Coordinates42.59076, -91.3039
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.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating55.3 US tons
Inventory rating42.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length83 ft (25.3 m)
Longest span31 ft (9.4 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44 (2022)
Projected traffic44 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 137th ST over Small Stream built?

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

What condition is 137th ST over Small Stream 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 October 2024.

How much traffic does 137th ST over Small Stream carry?

About 44 vehicles per day (2022 count).

How long is 137th ST over Small Stream?

The structure is 83 ft (25.3 m) long with a longest span of 31 ft (9.4 m) and a deck 33 ft wide.

Who owns 137th ST over Small Stream?

It is owned by the County Highway Agency.