US Bridges

San Hill RD over Red Rock Branch

Poor

Webster Parish, Louisiana · 1.2 MI E. of HWY 159 · Structure no. 046032597931691

Built
1986
39 years old
Condition
Poor
inspected July 2023
Type
Culvert
Steel
Length
34 ft
4 main spans
Daily traffic
268
2020 count
Owner
County
County Highway Agency

About this bridge

San Hill RD over Red Rock Branch is a steel culvert carrying San Hill RD over Red Rock Branch in Webster Parish, Louisiana. It was built in 1986, so it is 39 years old, younger than the Louisiana average of 43 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 268 vehicles a day, projected to reach 294 by 2040. The structure is 34 ft (10.4 m) long and 51 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSan Hill RD
CrossesRed Rock Branch
Location1.2 MI E. of HWY 159
RouteCounty Highway 0
CountyWebster Parish
StateLouisiana
Coordinates32.99277, -93.28251
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 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 adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating107.1 US tons
Inventory rating82.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans4
Design loadHS 20
Structure length34 ft (10.4 m)
Longest span6 ft (1.8 m)
Deck width51 ft (15.5 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic268 (2020)
Projected traffic294 by 2040
Trucks—
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was San Hill RD over Red Rock Branch built?

It was built in 1986, making it 39 years old in 2025.

What condition is San Hill RD over Red Rock Branch 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 July 2023.

How much traffic does San Hill RD over Red Rock Branch carry?

About 268 vehicles per day (2020 count).

How long is San Hill RD over Red Rock Branch?

The structure is 34 ft (10.4 m) long with a longest span of 6 ft (1.8 m) and a deck 51 ft wide.

Who owns San Hill RD over Red Rock Branch?

It is owned by the County Highway Agency.