US Bridges

SR1664 over SR1728

Poor

Wake County, North Carolina · 0.16 Mi. S. Jct. SR1774 · Structure no. 000000001830549

Built
1969
56 years old
Condition
Poor
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
251 ft
4 main spans
Daily traffic
16,500
2021 count
Owner
State
State Highway Agency

About this bridge

SR1664 over SR1728 is a steel stringer/multi-beam or girder carrying SR1664 over SR1728 in Wake County, North Carolina. It was built in 1969, so it is 56 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 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 16,500 vehicles a day, roughly 6% of them trucks, projected to reach 33,000 by 2040. The structure is 251 ft (76.5 m) long and 72 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSR1664
CrossesSR1728
Location0.16 Mi. S. Jct. SR1774
RouteState Highway 1664
CountyWake County
StateNorth Carolina
Coordinates35.80408, -78.70694
Functional classUrban Minor Arterial

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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72 US tons
Inventory rating43 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length251 ft (76.5 m)
Longest span89 ft (27.1 m)
Deck width72 ft (21.9 m)
Roadway width70 ft (21.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,500 (2021)
Projected traffic33,000 by 2040
Trucks6%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed0.6 mi (1 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR1664 over SR1728 built?

It was built in 1969, making it 56 years old in 2025.

What condition is SR1664 over SR1728 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 December 2023.

How much traffic does SR1664 over SR1728 carry?

About 16,500 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is SR1664 over SR1728?

The structure is 251 ft (76.5 m) long with a longest span of 89 ft (27.1 m) and a deck 72 ft wide.

Who owns SR1664 over SR1728?

It is owned by the State Highway Agency.