Hwy 140 over Jackson Bottom Slough
Washington County, Oregon · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Hwy 140 over Jackson Bottom Slough in Washington County, Oregon, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1966, making it 59 years old at the 2025 inventory.
- It carries about 8,728 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 11 of the 334 inventoried bridges in Washington County rated poor (3.3%); 11 (3.3%) 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 poor (substructure 5 to 4).
- Its most recent inspection on record is dated April 2024, on a 24-month routine inspection cycle.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (45.50546, -122.99096)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 5 | 4 | Poor condition |
Bridge details
| Structure | Prestressed concrete slab |
| Length | about 151 ft |
| Location | 0.9 Mi N of Hwy 29 |
| NBI structure number | 04962A140 00102 |
| Condition class | Poor |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | U: unknown foundation, not evaluated for scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oregon department of transportation.
Busiest bridges in Washington County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-5 (hwy 001) over Lower Boonesferry | 1975 | 156,558 | Fair |
| I-5 (hwy 001) over Tualatin River | 1975 | 156,016 | Fair |
| I-5 (hwy 001) over P&w RR | 1975 | 154,838 | Fair |
| US 26 (hwy 047) EB over Cedar Hills Blvd | 1966 | 144,211 | Fair |
| US 26 (hwy 047) over Hwy 144 | 1986 | 133,089 | Fair |
| US 26 (Hwy 047) over Light Rail Transit | 1996 | 133,089 | Fair |
All bridges nearby: Washington County, OR bridge conditions · every bridge in Washington County · Oregon bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.