Ia 21 over Coal Creek
Keokuk County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Ia 21 over Coal Creek in Keokuk County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1969, making it 56 years old at the 2025 inventory.
- It carries about 2,300 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 88 of the 183 inventoried bridges in Keokuk County rated fair (48.1%); 37 (20.2%) 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 August 2024, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (41.39917, -92.35467)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 48 ft |
| Location | 5.0 miles N of Jct. 92 |
| NBI structure number | 000000000032610 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2024 |
| Inspection interval (item 91) | 24 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 Iowa department of transportation.
Busiest bridges in Keokuk County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ia 92 over Rock Creek | 1964 | 3,400 | Fair |
| Ia 92 & 149 over Bridge Creek | 1967 | 3,110 | Fair |
| Ia 149 over North Skunk River | 1986 | 2,540 | Fair |
| Ia 23 over Stream | 1976 | 1,980 | Fair |
| Ia 21 over Stream | 1940 | 1,950 | Fair |
| Ia 21 over Cedar Creek | 1948 | 1,880 | Fair |
All bridges nearby: Keokuk County, IA bridge conditions · every bridge in Keokuk County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.