US Bridges

CR 306 over Unnamed Creek

Poor

Calhoun County, Mississippi · Sec 21 T23N R 9E B · Structure no. SA0700000000140

Built
1957
68 years old
Condition
Poor
inspected February 2024
Type
Culvert
Concrete
Length
42 ft
2 main spans
Daily traffic
970
2015 count
Owner
County
County Highway Agency

About this bridge

CR 306 over Unnamed Creek is a concrete culvert carrying CR 306 over Unnamed Creek in Calhoun County, Mississippi. It was built in 1957, so it is 68 years old, older than the Mississippi average of 38.9 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.

It carries about 970 vehicles a day, roughly 10% of them trucks, projected to reach 1,455 by 2035. The structure is 42 ft (12.8 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCR 306
CrossesUnnamed Creek
LocationSec 21 T23N R 9E B
RouteCounty Highway 820
CountyCalhoun County
StateMississippi
Coordinates33.84925, -89.36667
Functional classRural Major Collector

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
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionFebruary 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.8 US tons
Inventory rating42.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length42 ft (12.8 m)
Longest span16 ft (4.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic970 (2015)
Projected traffic1,455 by 2035
Trucks10%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$127,000
NavigationNo navigation control on waterway

Frequently asked questions

When was CR 306 over Unnamed Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is CR 306 over Unnamed Creek 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 February 2024.

How much traffic does CR 306 over Unnamed Creek carry?

About 970 vehicles per day (2015 count), of which roughly 10% are trucks.

How long is CR 306 over Unnamed Creek?

The structure is 42 ft (12.8 m) long with a longest span of 16 ft (4.9 m).

Who owns CR 306 over Unnamed Creek?

It is owned by the County Highway Agency.