US Bridges

SR1770 over Rocky River

FairPosted for load

Union County, North Carolina · 0.3 Mi. N. Anson Co.Line · Structure no. 000000001790450

Built
1957
68 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
200 ft
8 main spans
Daily traffic
170
2017 count
Owner
State
State Highway Agency

About this bridge

SR1770 over Rocky River is a steel stringer/multi-beam or girder carrying SR1770 over Rocky River in Union County, North Carolina. It was built in 1957, so it is 68 years old, older than the North Carolina average of 38.7 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. Its operating status is: posted for load restriction.

It carries about 170 vehicles a day, roughly 6% of them trucks, projected to reach 340 by 2040. The structure is 200 ft (60.9 m) long and 20 ft wide. If it were closed, the detour would be 12.4 mi (20 km).

Location

Open in Google Maps
CarriesSR1770
CrossesRocky River
Location0.3 Mi. N. Anson Co.Line
RouteState Highway 1770
CountyUnion County
StateNorth Carolina
Coordinates35.19507, -80.28246
Functional classRural Local

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating38.9 US tons
Inventory rating22.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans8
Design loadUnknown
Structure length200 ft (60.9 m)
Longest span24 ft (7.3 m)
Deck width20 ft (6 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic170 (2017)
Projected traffic340 by 2040
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed12.4 mi (20 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR1770 over Rocky River built?

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

What condition is SR1770 over Rocky River 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 February 2023.

How much traffic does SR1770 over Rocky River carry?

About 170 vehicles per day (2017 count), of which roughly 6% are trucks.

How long is SR1770 over Rocky River?

The structure is 200 ft (60.9 m) long with a longest span of 24 ft (7.3 m) and a deck 20 ft wide.

Who owns SR1770 over Rocky River?

It is owned by the State Highway Agency.