US Bridges

S-18-207 over Saw Mill Branch Canal

Fair

Dorchester County, South Carolina · In Sumrvl · Structure no. 000000000003637

Built
1961
64 years old
Condition
Fair
inspected April 2023
Type
Slab
Concrete
Length
45 ft
3 main spans
Daily traffic
6,400
2023 count
Owner
State
State Highway Agency

About this bridge

S-18-207 over Saw Mill Branch Canal is a concrete slab carrying S-18-207 over Saw Mill Branch Canal in Dorchester County, South Carolina. It was built in 1961, so it is 64 years old, older than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 6,400 vehicles a day, roughly 3% of them trucks, projected to reach 8,768 by 2043. The structure is 45 ft (13.7 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesS-18-207
CrossesSaw Mill Branch Canal
LocationIn Sumrvl
RouteState Highway 207
CountyDorchester County
StateSouth Carolina
Coordinates33.02071, -80.16601
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating46.7 US tons
Inventory rating27.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadH 15
Structure length45 ft (13.7 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,400 (2023)
Projected traffic8,768 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$167,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S-18-207 over Saw Mill Branch Canal built?

It was built in 1961, making it 64 years old in 2025.

What condition is S-18-207 over Saw Mill Branch Canal 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 2023.

How much traffic does S-18-207 over Saw Mill Branch Canal carry?

About 6,400 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is S-18-207 over Saw Mill Branch Canal?

The structure is 45 ft (13.7 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns S-18-207 over Saw Mill Branch Canal?

It is owned by the State Highway Agency.