Zoo Service Road over Rock Creek
District of Columbia, District of Columbia · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Zoo Service Road over Rock Creek in District of Columbia, District of Columbia, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 7 (good condition) on the 0-9 scale.
- It was built in 1930, making it 95 years old at the 2025 inventory.
- It carries about 400 vehicles a day (traffic count year 2012).
- It is one of 90 of the 261 inventoried bridges in District of Columbia rated good (34.5%); 5 (1.9%) 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 November 2024, on a 24-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 → (38.92781, -77.049)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Concrete deck arch |
| Length | about 79 ft |
| Location | Off Valley Trail By Amazo |
| NBI structure number | 2180001S0000000 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | November 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the District of Columbia department of transportation.
Busiest bridges in District of Columbia
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Anacostia Freeway over Good Hope Road | 1964 | 295,046 | Fair |
| Southwest Freeway over Half St to 2ND St SW | 1963 | 252,820 | Fair |
| Southeast Frwy over CSX RR NJ & VA Ave | 1964 | 252,800 | Fair |
| NB I-395 over Potomac River & Ohio Dr. | 1950 | 249,000 | Fair |
| SB I-395 over Potomac R. and Ohio Dr. | 1960 | 249,000 | Fair |
| Southwest Freeway over Wash Channel & Maine | 1961 | 183,000 | Fair |
All bridges nearby: District of Columbia, DC bridge conditions · every bridge in District of Columbia · District of Columbia bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.