US Bridges

KY-1550 over Unname Stream

Good

Calloway County, Kentucky · .40 MI West of JCT Ky 783 · Structure no. 018B00076N

Built
1955
70 years old
Condition
Good
inspected May 2023
Type
Culvert
Concrete
Length
40 ft
3 main spans
Daily traffic
292
2021 count
Owner
State
State Highway Agency

About this bridge

KY-1550 over Unname Stream is a concrete culvert carrying KY-1550 over Unname Stream in Calloway County, Kentucky. It was built in 1955, so it is 70 years old, older than the Kentucky average of 46.6 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 292 vehicles a day, projected to reach 292 by 2041. The structure is 40 ft (12.2 m) long and 24 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesKY-1550
CrossesUnname Stream
Location.40 MI West of JCT Ky 783
RouteState Highway 1550
CountyCalloway County
StateKentucky
Coordinates36.58139, -88.395
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating45 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadH 15
Structure length40 ft (12.2 m)
Longest span12 ft (3.7 m)
Deck width24 ft (7.3 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic292 (2021)
Projected traffic292 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was KY-1550 over Unname Stream built?

It was built in 1955, making it 70 years old in 2025.

What condition is KY-1550 over Unname 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 May 2023.

How much traffic does KY-1550 over Unname Stream carry?

About 292 vehicles per day (2021 count).

How long is KY-1550 over Unname Stream?

The structure is 40 ft (12.2 m) long with a longest span of 12 ft (3.7 m) and a deck 24 ft wide.

Who owns KY-1550 over Unname Stream?

It is owned by the State Highway Agency.