US Bridges

N1730 over Spillway of Lake

Fair

Ellis County, Oklahoma · 8.3W 5.7S of Arnett · Structure no. 211350000000000

Built
1986
39 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
28 ft
1 main span
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

N1730 over Spillway of Lake is a steel stringer/multi-beam or girder carrying N1730 over Spillway of Lake in Ellis County, Oklahoma. It was built in 1986, so it is 39 years old, younger than the Oklahoma average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 100 vehicles a day, roughly 15% of them trucks, projected to reach 160 by 2042. The structure is 28 ft (8.5 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesN1730
CrossesSpillway of Lake
Location8.3W 5.7S of Arnett
RouteCounty Highway N1730
CountyEllis County
StateOklahoma
Coordinates36.0575, -99.91491
Functional classRural Major Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating58 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span27 ft (8.2 m)
Deck width27 ft (8.2 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2022)
Projected traffic160 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$256,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N1730 over Spillway of Lake built?

It was built in 1986, making it 39 years old in 2025.

What condition is N1730 over Spillway of Lake 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 April 2024.

How much traffic does N1730 over Spillway of Lake carry?

About 100 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is N1730 over Spillway of Lake?

The structure is 28 ft (8.5 m) long with a longest span of 27 ft (8.2 m) and a deck 27 ft wide.

Who owns N1730 over Spillway of Lake?

It is owned by the County Highway Agency.