US Bridges

Mountain Hill RD over I-185 @20.10N(SR 411)

Good

Harris County, Georgia · 8.5 MI SW of Hamilton · Structure no. 000000014500330

Built
1978
47 years old
Condition
Good
inspected September 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
412 ft
2 main spans
Daily traffic
1,420
2024 count
Owner
State
State Highway Agency

About this bridge

Mountain Hill RD over I-185 @20.10N(SR 411) is a prestressed concrete continuous box beam or girders - single or spread carrying Mountain Hill RD over I-185 @20.10N(SR 411) in Harris County, Georgia. It was built in 1978, so it is 47 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 1,420 vehicles a day, roughly 1% of them trucks, projected to reach 735 by 2032. The structure is 412 ft (125.6 m) long and 34 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

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CarriesMountain Hill RD
CrossesI-185 @20.10N(SR 411)
Location8.5 MI SW of Hamilton
RouteCounty Highway 385
CountyHarris County
StateGeorgia
Coordinates32.67877, -84.98938
Functional classRural Minor Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.9 US tons
Inventory rating26.9 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 15
Structure length412 ft (125.6 m)
Longest span206 ft (62.8 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,420 (2024)
Projected traffic735 by 2032
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed14.9 mi (24 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mountain Hill RD over I-185 @20.10N(SR 411) built?

It was built in 1978, making it 47 years old in 2025.

What condition is Mountain Hill RD over I-185 @20.10N(SR 411) 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 September 2023.

How much traffic does Mountain Hill RD over I-185 @20.10N(SR 411) carry?

About 1,420 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is Mountain Hill RD over I-185 @20.10N(SR 411)?

The structure is 412 ft (125.6 m) long with a longest span of 206 ft (62.8 m) and a deck 34 ft wide.

Who owns Mountain Hill RD over I-185 @20.10N(SR 411)?

It is owned by the State Highway Agency.