Merrill Ranch Pkwy over Walker Butte Wash
Pinal County, Arizona · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Merrill Ranch Pkwy over Walker Butte Wash in Pinal County, Arizona, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
- It was built in 2005, making it 20 years old at the 2025 inventory.
- It carries about 1,567 vehicles a day (traffic count year 2020).
- Its listed owner is a town or township highway agency.
- It is one of 454 of the 717 inventoried bridges in Pinal County rated good (63.3%); 7 (1.0%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated fair in the 2024 inventory and is now good (culvert 6 to 7).
- Its most recent inspection on record is dated May 2024, 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 → (33.06208, -111.47947)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 6 | 7 | Good condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 62 ft |
| Location | 0.2 mi E of Hunt Hwy |
| NBI structure number | 10815 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2024 |
| 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 Arizona department of transportation.
Busiest bridges in Pinal County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SR 79 over Wash | 1952 | 179,518 | Fair |
| US 60 over Ironwood Drive | 1990 | 77,864 | Fair |
| US 60 over Wash | 1990 | 75,394 | Fair |
| Irr I 10; EB & WB over Wash | 1967 | 60,638 | Good |
| Irr I 10; EB & WB over Wash | 1967 | 60,638 | Good |
| Irr I 10 over Wash | 1967 | 60,638 | Good |
All bridges nearby: Pinal County, AZ bridge conditions · every bridge in Pinal County · Arizona bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.