What You'll Find in Columbia Slough

Columbia Slough is a 15-mile channel that winds through northeast Portland, connecting the Willamette River near Kelley Point Park to the Columbia River downstream. It's a slow-moving, murky waterway lined with cottonwoods, willows, and industrial areas—nothing like the clear mountain streams most Oregon anglers picture. The water is warm, shallow in most sections, and holds warmwater fish year-round.

The slough holds largemouth bass, smallmouth bass, crappie, bluegill, and catfish. Largemouths are the main draw. The bass here run smaller than you'd find in dedicated bass lakes—most fish run 10 to 14 inches—but they're plentiful and willing. The slough also has a reputation for producing occasional larger catfish, especially in deeper holes near the Willamette confluence.

Access is limited compared to other Portland waters. Most of the slough runs through private property, industrial zones, or protected wetland areas. Public access points exist, but they're scattered and not always obvious from the road.

Key Takeaways

  • Columbia Slough holds largemouth bass, smallmouth bass, crappie, and catfish in warm, shallow water that fishes year-round.
  • Public access is limited to a handful of specific parks and boat launches; much of the slough runs through private land or protected wetlands.
  • Early morning and late evening produce better fishing than midday, especially in summer when the water warms.
  • Soft plastics, small crankbaits, and live shiners work better than large lures in the slough's shallow, weedy habitat.
  • The slough's water quality varies by section; check current conditions before fishing and avoid swallowing water.

Where to Access the Slough

Kelley Point Park is the most reliable public access point. Located at the confluence of the Willamette and Columbia Rivers, it has a boat launch, parking, and a paved path along the water. From here you can motor or paddle upstream into the slough proper. The park sits at the northwest edge of Portland, accessible via North Marine Drive.

Whitaker Ponds Wildlife Refuge, managed by the Audubon Society of Portland, sits along the slough's middle section near Northeast 82nd Avenue. It has a small parking area and walking trails that approach the water, though motorized boats are not allowed. This is better for bank fishing or kayaking than for launching a larger boat.

Springwater Corridor Trail runs alongside portions of the slough and offers bank access in several spots, particularly near Northeast 33rd Avenue and Northeast Glisan Street. Parking is street-side and limited. This route works if you're walking or biking to fish, but launching a boat here is not practical.

Before heading out, call the Portland Parks and Recreation office or check their website to confirm current access and any seasonal closures. Wetland restoration work occasionally closes sections temporarily.

Best Times and Techniques

Bass in the slough are most active in early morning and late evening, especially from May through September. Midday fishing is slower, particularly when the sun is high and the water temperature climbs into the 70s. Winter fishing is possible—the slough doesn't freeze—but the bite slows considerably and water conditions can be murky.

Soft plastics work better here than anywhere else. Throw 4- to 6-inch worms, creature baits, and small swimbaits in dark colors—black, brown, and dark green. Work them slowly along the bottom and around submerged wood. The slough has plenty of fallen trees and root wads; bass hold tight to this cover.

Small crankbaits in the 2- to 3-inch range also produce, especially early in the morning. Stick to shallow-running models that stay in the top 3 to 4 feet. Live shiners or small crawfish, fished under a bobber or on a light jig, work well for crappie and bluegill in the deeper holes near the Willamette.

Catfish fishing is best at night with cut bait—mackerel, herring, or chicken liver—fished on the bottom in the deeper sections. The slough's catfish are most active from late spring through early fall.

Boat Types and Navigation

A small aluminum boat, kayak, or canoe is ideal for the slough. The water is shallow—2 to 6 feet in most places—and narrow in sections, so a large bass boat or cabin cruiser will limit where you can go. If you launch at Kelley Point, you can run upstream with a small outboard or electric motor, but expect to slow down and navigate around submerged logs and shallow bars.

Kayaks and canoes are popular and practical. They're quiet, draw minimal water, and let you explore narrow channels and backwater areas where motorboats can't reach. Parking and launching are easier at Whitaker Ponds if you're paddling.

The current is minimal—the slough is essentially a slow-moving channel—so paddling upstream is not strenuous. Plan for a round trip of 3 to 5 hours if you're exploring from Kelley Point.

Water Quality and Safety Concerns

Columbia Slough's water quality is a real consideration. The slough receives stormwater runoff from the surrounding urban area, and the water is often turbid and discolored. After heavy rain, avoid fishing for 24 to 48 hours—the runoff makes conditions worse and fish are less active anyway.

Do not swim in the slough or allow children to wade. Do not drink the water or let it get in your mouth. Wash your hands and any cuts after handling fish or being in the water. The Oregon Department of Environmental Quality monitors the slough, and advisories are posted if contamination spikes; check their website before you go.

Wear a personal flotation device if you're in a boat or kayak. The slough is not deep, but cold water and limited visibility make it risky if you go overboard. Bring a headlamp or flashlight if you're fishing early or late; the slough is poorly lit in places, and navigation is harder in low light.

Regulations and Licensing

You need an Oregon fishing license to fish Columbia Slough, whether from shore or boat. A one-day license costs less than a full-year license and is available online through the Oregon Department of Fish and Wildlife website or at most sporting goods stores in Portland.

Bass have a year-round season in the slough with a daily limit of five fish per person. Crappie and bluegill have no closed season and a daily limit of 25 fish combined. Catfish have no closed season and no daily limit. Size restrictions vary—check the current Oregon fishing synopsis before you fish, as rules can change.

The slough is open to public fishing, but respect posted signs and private property boundaries. Some sections are closed to protect nesting waterfowl or restoration work; these are marked with signs.

What to Bring and How to Prepare

Pack light. Bring a small tackle box with soft plastics, a few crankbaits, and basic terminal tackle. A 6- to 7-foot medium-power spinning rod works for everything in the slough. Bring polarized sunglasses—they help you see structure and shallow fish. A net is useful for landing bass, especially if you're in a kayak.

Bring more water than you think you'll need, sunscreen, and insect repellent. The slough has mosquitoes, particularly in summer and after rain. A hat and long sleeves help. If you're launching a boat, arrive early—parking at Kelley Point fills up on weekends.

Check the weather and water conditions before you go. The slough can get choppy if wind picks up, and visibility is already limited. A calm morning is always better than an afternoon with wind.

Frequently Asked Questions

Can I fish Columbia Slough year-round?

Yes. The slough doesn't freeze, and bass, crappie, and catfish are present all year. Winter fishing is slower and water conditions are often murky, but it's possible. Spring through fall is more productive.

Do I need a boat to fish the slough?

No. Bank access exists at Whitaker Ponds and along portions of the Springwater Corridor Trail. A kayak or canoe opens up more water and is easier to launch than a motorboat, but you can catch fish from shore if you know where to go.

What's the biggest bass caught in Columbia Slough?

The slough produces occasional bass in the 4- to 5-pound range, but most fish run 10 to 14 inches. It's a numbers fishery, not a trophy fishery. Patience and small lures work better than hunting for giants.

Is the slough safe to fish after rain?

Wait 24 to 48 hours after heavy rain. Stormwater runoff makes the water dirtier and the fish less active. Water quality advisories are sometimes posted; check the Oregon DEQ website before you go.

Where do I buy a fishing license in Portland?

Buy online through the Oregon Department of Fish and Wildlife website, or visit any sporting goods store, many grocery stores, and some outdoor retailers. A one-day license is the cheapest option if you're trying the slough for the first time.