US Bridges

SR-66 over Hydraulic Spillway

Fair

Miami County, Ohio · 1.8MI.N. of Jct. USR-36 · Structure no. 5501628

Built
1960
65 years old
Condition
Fair
inspected March 2024
Type
Slab
Concrete
Length
34 ft
1 main span
Daily traffic
4,672
2015 count
Owner
State
State Highway Agency

About this bridge

SR-66 over Hydraulic Spillway is a concrete slab carrying SR-66 over Hydraulic Spillway in Miami County, Ohio. It was built in 1960, so it is 65 years old, older than the Ohio average of 47.3 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.

It carries about 4,672 vehicles a day, roughly 6% of them trucks, projected to reach 6,485 by 2035. The structure is 34 ft (10.4 m) long and 44 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesSR-66
CrossesHydraulic Spillway
Location1.8MI.N. of Jct. USR-36
RouteState Highway 66
CountyMiami County
StateOhio
Coordinates40.17004, -84.25782
Functional classUrban Minor Arterial

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating50 US tons
Inventory rating38.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length34 ft (10.4 m)
Longest span31 ft (9.4 m)
Deck width44 ft (13.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,672 (2015)
Projected traffic6,485 by 2035
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR-66 over Hydraulic Spillway built?

It was built in 1960, making it 65 years old in 2025.

What condition is SR-66 over Hydraulic Spillway 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 March 2024.

How much traffic does SR-66 over Hydraulic Spillway carry?

About 4,672 vehicles per day (2015 count), of which roughly 6% are trucks.

How long is SR-66 over Hydraulic Spillway?

The structure is 34 ft (10.4 m) long with a longest span of 31 ft (9.4 m) and a deck 44 ft wide.

Who owns SR-66 over Hydraulic Spillway?

It is owned by the State Highway Agency.