US Bridges

Knox Road over Toomsuba Creek

Good

Lauderdale County, Mississippi · Sec 22 T 7N R17E B · Structure no. SA3800000000209

Built
1989
36 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
1 main span
Daily traffic
181
2023 count
Owner
County
County Highway Agency

About this bridge

Knox Road over Toomsuba Creek is a steel stringer/multi-beam or girder carrying Knox Road over Toomsuba Creek in Lauderdale County, Mississippi. It was built in 1989, so it is 36 years old, younger than the Mississippi average of 38.9 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 181 vehicles a day, roughly 8% of them trucks, projected to reach 254 by 2043. The structure is 60 ft (18.3 m) long and 31 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesKnox Road
CrossesToomsuba Creek
LocationSec 22 T 7N R17E B
RouteCounty Highway 170
CountyLauderdale County
StateMississippi
Coordinates32.43545, -88.54956
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating105.1 US tons
Inventory rating62.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span58 ft (17.7 m)
Deck width31 ft (9.3 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic181 (2023)
Projected traffic254 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$340,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Knox Road over Toomsuba Creek built?

It was built in 1989, making it 36 years old in 2025.

What condition is Knox Road over Toomsuba 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 October 2023.

How much traffic does Knox Road over Toomsuba Creek carry?

About 181 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Knox Road over Toomsuba Creek?

The structure is 60 ft (18.3 m) long with a longest span of 58 ft (17.7 m) and a deck 31 ft wide.

Who owns Knox Road over Toomsuba Creek?

It is owned by the County Highway Agency.