Bridge conditions in Dubuque County, Iowa
346 inventoried bridges · 25 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
25 of the 346 bridges the federal inventory lists in Dubuque County are rated poor; the rest split 180 good and 141 fair.
- 25 of the 346 bridges in Dubuque County, Iowa, are rated in poor condition (7.2%) in the 2025 National Bridge Inventory, as of .
- 180 bridges (52.0%) are rated good and 141 (40.8%) fair.
- The median Dubuque County bridge was built in 1996.
- The busiest poor-rated bridge is 3RD Ave SW over N Fork Maquoketa River (built 1967), carrying about 1,651 vehicles a day.
Good 52.0% · Fair 40.8% · Poor 7.2% of 346 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| 3RD Ave SW over N Fork Maquoketa River | 1967 | 1,651 | Poor |
| Local over South Fork Catfish Creek | 1926 | 756 | Poor |
| FM over Small | 1996 | 540 | Poor |
| Wildwood Dr over Bee Branch | 1970 | 537 | Poor |
| Local over Catfish Creek | 1980 | 530 | Poor |
| Dyersville East Rd over Creek | 1964 | 511 | Poor |
| FM over Creek | 1962 | 490 | Poor |
| FM over Creek | 1920 | 310 | Poor |
| Local over Creek | 1998 | 206 | Poor |
| Local over Creek | 1997 | 130 | Poor |
| Fish Pond Rd over Creek | 1997 | 128 | Poor |
| Local over Creek | 1940 | 120 | Poor |
| Local over Creek | 1936 | 110 | Poor |
| Local over Stream | 1981 | 90 | Poor |
| Local over Creek | 1928 | 78 | Poor |
| FM over Lytle Creek | 1977 | 50 | Poor |
| Local over Granger Creek | 1925 | 45 | Poor |
| Local over Creek | 1925 | 44 | Poor |
| FM over Creek | 1950 | 39 | Poor |
| Local over Creek | 1925 | 30 | Poor |
| FM over Stream | 1941 | 25 | Poor |
| Local over Creek | 1940 | 20 | Poor |
| Local over Creek | 1971 | 20 | Poor |
| Creek Branch Lane over Prairie Creek | 1900 | 11 | Poor |
| Entrance over Side Ditch Bridge | 1912 | 10 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 20 over N Branch Catfish Creek | 1939 | 33,600 | Fair |
| US 61 & 151 over Peosta Chl & City St | 1991 | 22,300 | Fair |
| US 61 & 151 over Mississippi River Island | 1982 | 20,400 | Fair |
| US 20 US 52 over Drainage Ditch | 1957 | 18,500 | Fair |
| US 20 over Miss. River Hwy & RR | 1943 | 17,700 | Fair |
| EB US 20 over Mid Br Catfish Ck Cc RR | 1995 | 14,300 | Good |
| WB US 20 over Mid Br Catfish Ck Cc RR | 1961 | 14,300 | Fair |
| NB US 61/151 over 4TH 5TH White St | 1992 | 13,200 | Fair |
| US 20 US 52 over Drainage Ditch | 1960 | 12,500 | Good |
| US 61/151 SB over 4TH 5TH White St | 1992 | 12,300 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Iowa: Iowa bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.