Ar-18 over Big Lake Relief
Mississippi County, Arkansas · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Ar-18 over Big Lake Relief in Mississippi County, Arkansas, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2019, making it 6 years old at the 2025 inventory.
- It carries about 6,300 vehicles a day (traffic count year 2016).
- Its listed owner is the state highway agency.
- It is one of 178 of the 309 inventoried bridges in Mississippi County rated good (57.6%); 22 (7.1%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated September 2021, on a 48-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (35.84781, -90.12377)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 9 | 9 | Excellent condition |
| Substructure | 9 | 9 | Excellent condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 436 ft |
| Location | 3.1 Mi. E Manilla |
| NBI structure number | 000000000007392 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2021 |
| Inspection interval (item 91) | 48 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Arkansas department of transportation.
Busiest bridges in Mississippi County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-55- 12- Lm 31.40 over Ditch No 4 | 1960 | 20,074 | Fair |
| I-55- 12- Lm 37.86 over Ditch No 51 | 1961 | 20,040 | Fair |
| I-55-sec 12- 50.00 over Ditch No 43 | 1962 | 19,000 | Fair |
| I-55-sec 12- 52.30 over Ditch No 41 | 1962 | 19,000 | Fair |
| I -55 Sec 12-69.84 over Ditch No 30 | 1963 | 19,000 | Fair |
| I-55 Frontage Rd-l over Ditch No 6 | 1960 | 18,899 | Good |
All bridges nearby: Mississippi County, AR bridge conditions · every bridge in Mississippi County · Arkansas bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.