US Bridges

Nfa 1394 (sa 4603) over Morgan Branch

Fair

Johnson County, Tennessee · Big Dry Run Rd-Near Lake · Structure no. 46S24610007

Built
1955
70 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete Continuous
Length
33 ft
3 main spans
Daily traffic
369
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1394 (sa 4603) over Morgan Branch is a concrete continuous culvert carrying Nfa 1394 (sa 4603) over Morgan Branch in Johnson County, Tennessee. It was built in 1955, so it is 70 years old, older than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 369 vehicles a day, roughly 3% of them trucks, projected to reach 590 by 2042. The structure is 33 ft (10 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNfa 1394 (sa 4603)
CrossesMorgan Branch
LocationBig Dry Run Rd-Near Lake
RouteCounty Highway 1394
CountyJohnson County
StateTennessee
Coordinates36.33712, -81.90963
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.5 US tons
Inventory rating24.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length33 ft (10 m)
Longest span10 ft (3 m)
Deck width33 ft (10.2 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic369 (2021)
Projected traffic590 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 1394 (sa 4603) over Morgan Branch built?

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

What condition is Nfa 1394 (sa 4603) over Morgan Branch in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2024.

How much traffic does Nfa 1394 (sa 4603) over Morgan Branch carry?

About 369 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 1394 (sa 4603) over Morgan Branch?

The structure is 33 ft (10 m) long with a longest span of 10 ft (3 m) and a deck 33 ft wide.

Who owns Nfa 1394 (sa 4603) over Morgan Branch?

It is owned by the County Highway Agency.