US Bridges

FM 877 over S Prong Dam Spillway

Fair

Ellis County, Texas · 4.3 MI SE of US 77 · Structure no. 180710116001006

Built
1956
69 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
240 ft
8 main spans
Daily traffic
1,588
2022 count
Owner
State
State Highway Agency

About this bridge

FM 877 over S Prong Dam Spillway is a concrete stringer/multi-beam or girder carrying FM 877 over S Prong Dam Spillway in Ellis County, Texas. It was built in 1956, so it is 69 years old, older than the Texas average of 44.4 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 1,588 vehicles a day, roughly 17% of them trucks, projected to reach 2,223 by 2042. The structure is 240 ft (73.2 m) long and 25 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesFM 877
CrossesS Prong Dam Spillway
Location4.3 MI SE of US 77
RouteState Highway 877
CountyEllis County
StateTexas
Coordinates32.33767, -96.80352
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans8
Design loadH 15
Structure length240 ft (73.2 m)
Longest span30 ft (9.1 m)
Deck width25 ft (7.5 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,588 (2022)
Projected traffic2,223 by 2042
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$14,000
NavigationNo navigation control on waterway

Frequently asked questions

When was FM 877 over S Prong Dam Spillway built?

It was built in 1956, making it 69 years old in 2025.

What condition is FM 877 over S Prong Dam 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 October 2023.

How much traffic does FM 877 over S Prong Dam Spillway carry?

About 1,588 vehicles per day (2022 count), of which roughly 17% are trucks.

How long is FM 877 over S Prong Dam Spillway?

The structure is 240 ft (73.2 m) long with a longest span of 30 ft (9.1 m) and a deck 25 ft wide.

Who owns FM 877 over S Prong Dam Spillway?

It is owned by the State Highway Agency.