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The Portland Marathon is Sunday, October 4, 2026, with a 7 a.m. start. Expect road restrictions along the course, a scheduled Broadway Bridge vehicle closure, and possible delays on four MAX lines. Impacts vary by location and time, and some continue into the afternoon.
What drivers should expect
Portland Police says streets along the course will have significant closures and traffic delays. Race-route streets cannot be driven on or crossed while runners are present; traffic can resume only after the last runner has passed and traffic-control devices are removed. The marathon’s Downtown route information says race streets are posted no-parking from 2 p.m. Saturday, October 3, through 2 p.m. Sunday, October 4.
Allow extra time if traveling through Downtown, Northwest Portland, the Lloyd District, South Portland, or other course neighborhoods. Closures are not a single all-day, citywide shutdown: their timing and effect depend on the street and the progress of the race. Check the marathon’s neighborhood traffic maps before choosing a route.
Key bridge and street restrictions
- Broadway Bridge: Closed to vehicles from 7:15 to 9:45 a.m., according to the Portland Police Bureau’s October 2 alert.
- Naito Parkway: Significant closures begin at 7 a.m., Portland Police says. ODOT separately lists a southbound closure on a section of OR 99W/Naito Parkway from 6 a.m. to 2:30 p.m.
- Burnside Bridge: Expected to remain open for most of the event, but there will be a brief full closure and other early restrictions.
- Hawthorne and Sellwood bridges: Temporary traffic restrictions are expected.
ODOT-listed highway impacts
ODOT lists the following closures and restriction for Sunday, October 4, from 6 a.m. to 2:30 p.m. The milepost ranges identify the affected segments:
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| Road | Direction and affected segment | Impact |
|---|---|---|
| I-5 | Northbound, MP 300.81–300.89 | Closure |
| OR 43 | Southbound, MP 0.00–2.71 | Closure |
| US 26 (Ross Island Way) | Eastbound, MP 0.32–1.32 | Closure |
| OR 99W/Naito Parkway | Southbound, MP 1.31–1.43 | Closure |
| OR 99E | Northbound, MP 1.47–3.72 | Width restricted to 18 feet |
These highway details come from ODOT’s Region 1 project updates. The OR 99E restriction is a width limit, not a full closure.
How the marathon may affect MAX
TriMet says MAX Blue, Orange, Red, and Yellow lines may experience delays between 5 a.m. and 2 p.m. on October 4. This is a possible-delay advisory; it does not mean all four lines will be delayed continuously throughout that period. Check TriMet service alerts or TransitTracker close to departure for current conditions.
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Plan your trip around the race
- Check the route near your start and destination. Use the marathon’s neighborhood traffic maps to identify course streets and nearby closures.
- Allow extra time or choose another driving route. Pay particular attention to the Broadway Bridge window, Naito Parkway restrictions, and ODOT’s listed highway impacts if your trip crosses those areas.
- Check transit shortly before leaving. Review TriMet alerts or TransitTracker for the line and time you plan to ride; the advisory identifies possible delays, not a fixed delay for every train.
- Follow posted closures and traffic control. Do not drive onto or across a race street while runners are present, even if a route appears clear.
The official notices do not provide a complete timetable for every street closure or a full list of bus-route detours. For a particular trip, the neighborhood map and live TriMet information are the best checks for the latest available details.
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