US Bridges

Nfa B100 over Obion R. Drainage Canel

PoorPosted for load

Obion County, Tennessee · 0.75 MI N of Dyer County · Structure no. 660B1000001

Built
1928
97 years old
Condition
Poor
inspected March 2023
Type
Tee Beam
Concrete
Length
200 ft
7 main spans
Daily traffic
1,380
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa B100 over Obion R. Drainage Canel is a concrete tee beam carrying Nfa B100 over Obion R. Drainage Canel in Obion County, Tennessee. It was built in 1928, so it is 97 years old, older than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 1,380 vehicles a day, roughly 4% of them trucks, projected to reach 2,208 by 2041. The structure is 200 ft (61 m) long and 23 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesNfa B100
CrossesObion R. Drainage Canel
Location0.75 MI N of Dyer County
RouteCounty Highway 100
CountyObion County
StateTennessee
Coordinates36.21684, -89.19669
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating12.1 US tons
Inventory rating9.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length200 ft (61 m)
Longest span29 ft (8.8 m)
Deck width23 ft (7.1 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,380 (2020)
Projected traffic2,208 by 2041
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.3 million (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa B100 over Obion R. Drainage Canel built?

It was built in 1928, making it 97 years old in 2025.

What condition is Nfa B100 over Obion R. Drainage Canel in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2023.

How much traffic does Nfa B100 over Obion R. Drainage Canel carry?

About 1,380 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is Nfa B100 over Obion R. Drainage Canel?

The structure is 200 ft (61 m) long with a longest span of 29 ft (8.8 m) and a deck 23 ft wide.

Who owns Nfa B100 over Obion R. Drainage Canel?

It is owned by the County Highway Agency.