US Bridges

Northbrook Parkway over Mill Creek

Good

Gwinnett County, Georgia · 1 MI SE of Suwanee · Structure no. 000000013552400

Built
2011
14 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
400 ft
3 main spans
Daily traffic
2,047
2024 count
Owner
County
County Highway Agency

About this bridge

Northbrook Parkway over Mill Creek is a prestressed concrete stringer/multi-beam or girder carrying Northbrook Parkway over Mill Creek in Gwinnett County, Georgia. It was built in 2011, so it is 14 years old, younger than the Georgia average of 47.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,047 vehicles a day, roughly 1% of them trucks, projected to reach 2,895 by 2032. The structure is 400 ft (121.9 m) long and 87 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNorthbrook Parkway
CrossesMill Creek
Location1 MI SE of Suwanee
RouteCounty Highway 3779
StateGeorgia
Coordinates34.01885, -84.05737
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating35.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length400 ft (121.9 m)
Longest span140 ft (42.7 m)
Deck width87 ft (26.4 m)
Roadway width72 ft (21.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,047 (2024)
Projected traffic2,895 by 2032
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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$3.6 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Northbrook Parkway over Mill Creek built?

It was built in 2011, making it 14 years old in 2025.

What condition is Northbrook Parkway over Mill Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.

How much traffic does Northbrook Parkway over Mill Creek carry?

About 2,047 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is Northbrook Parkway over Mill Creek?

The structure is 400 ft (121.9 m) long with a longest span of 140 ft (42.7 m) and a deck 87 ft wide.

Who owns Northbrook Parkway over Mill Creek?

It is owned by the County Highway Agency.