County Rd 18 over South Myrtle Creek
Douglas County, Oregon · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- County Rd 18 over South Myrtle Creek in Douglas County, Oregon, 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 2024, making it 1 years old at the 2025 inventory.
- It carries about 272 vehicles a day (traffic count year 2020).
- Its listed owner is the county highway agency.
- It is one of 246 of the 703 inventoried bridges in Douglas County rated good (35.0%); 17 (2.4%) are rated poor.
- Its traffic status in the 2025 inventory is open, would be posted or closed except for temporary shoring or other temporary measures (NBI item 41).
- It does not appear under this structure number in the 2024 inventory (a new or renumbered structure).
- Its most recent inspection on record is dated October 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 → (43.03063, -123.10398)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 8 | Very good condition |
| Superstructure | 8 | Very good condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 115 ft |
| Location | 10.7 Mi E of Myrtle Creek |
| NBI structure number | T19C04301801071 |
| Condition class | Good |
| Traffic status (item 41) | Open, would be posted or closed except for temporary shoring or other temporary measures |
| Last inspection (item 90) | October 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 6: scour evaluation not yet made |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oregon department of transportation.
Busiest bridges in Douglas County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-5 (hwy 001) over I-5 @ Bellows St | 1976 | 46,894 | Fair |
| I-5 (hwy 001) over I-5 @ Harvard Ave | 1976 | 46,894 | Fair |
| I-5 (hwy 001) over I-5 @ Portland Ave | 1954 | 42,268 | Fair |
| I-5 (hwy 001) over I-5 @ Speedway Rd | 1955 | 41,824 | Fair |
| I-5 (hwy 001) over I-5 @ Mclain Rd | 2009 | 41,701 | Fair |
| I-5 (hwy 001) over Creek | 1954 | 29,858 | Fair |
All bridges nearby: Douglas County, OR bridge conditions · every bridge in Douglas County · Oregon bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.