What Colo Lake offers anglers

Colo Lake is a shallow, 360-acre impoundment in Fayette County, Iowa, about 20 minutes south of Fenton. The lake runs roughly 3 miles long and averages 8 to 10 feet deep, with a maximum depth around 18 feet. It holds walleye, northern pike, largemouth bass, and panfish—primarily bluegill and crappie. The shallow structure and sediment-rich water make it a different kind of fishery than the clearer, deeper lakes you might fish elsewhere in the region.

Colo Lake is managed by the Iowa Department of Natural Resources and is open year-round. The lake has a public boat ramp on the north shore, managed parking, and a small picnic area. It draws local anglers and a steady stream of visitors from the surrounding counties, especially during spring walleye season and summer pike fishing.

Key Takeaways

  • Colo Lake is a shallow, 360-acre walleye and pike lake in Fayette County with an average depth of 8 to 10 feet and a public boat ramp on the north shore.
  • Spring (April through May) is peak walleye season; summer and fall favor pike anglers working shallow weed edges and structure.
  • The lake's sediment-rich water and shallow basin mean you need to adjust your presentations—slower retrieves, live bait, and patience work better than on clearer lakes.
  • Iowa fishing licenses are required; current regulations on size and bag limits are available through the Iowa DNR website.
  • The north shore boat ramp is the main public access point; launching fees and amenities vary by season.

Spring walleye fishing on Colo Lake

April and May are the prime months for walleye on Colo Lake. As water temperatures climb from the low 40s into the 50s, walleye move from the deepest holes into the shallower flats and along the shoreline structure. The lake's shallow basin means walleye don't have to travel far—they're often in 6 to 10 feet of water within casting distance of the bank.

Live bait works best during spring. Shiners, crawlers, and small minnows fished on a simple jig-and-minnow rig or a slip sinker setup will take fish consistently. Work the deeper edges of weed beds, around any submerged timber, and along the north and west shorelines where the sun warms the water first. Trolling crankbaits in the 2 to 4-foot range also produces, especially early morning and late evening. The water clarity is low, so walleye rely more on vibration and smell than sight—don't hesitate to use darker lures or add scent to your presentations.

Summer pike and bass fishing

By June, water temperatures push into the 70s and walleye move deeper or become less active during the day. Northern pike, however, are aggressive throughout summer. Pike on Colo Lake hunt the shallow weed edges, particularly on the south and east sides where vegetation is thickest. Early morning and late evening are most productive, but pike will bite throughout the day if you're working the right cover.

Cast large topwater plugs, spinnerbaits, and soft plastics along weed lines. Pike in shallow lakes like Colo often hit hard and fast—set the hook immediately. Largemouth bass also inhabit the weed beds and will take similar presentations. Panfish (bluegill and crappie) are abundant and provide a reliable option if pike and bass are slow. Fish small jigs or live crickets around any submerged structure, fallen trees, or the deeper edges of weed beds in 8 to 12 feet of water.

Fall fishing and water conditions

September through October brings another strong bite as water temperatures drop back into the 60s and 50s. Walleye become active again, and pike feed heavily in preparation for winter. The same spring tactics apply—live bait, jigs, and crankbaits in the shallower zones. Weed beds begin to die back, which concentrates fish and makes them easier to locate.

Colo Lake's water is typically stained to turbid, especially after rain or wind. This is normal for a shallow, sediment-rich impoundment and actually favors anglers—fish rely on vibration and smell, so you can use louder, darker lures and don't need the precision casting required on clearer lakes. Wind can make the lake choppy quickly, so check the forecast before launching and be prepared to move to the lee shore if conditions deteriorate.

Access, facilities, and regulations

The primary public access is the boat ramp on the north shore, near the Colo Lake Wildlife Area parking lot. The ramp is maintained year-round, though winter conditions can make launching difficult. There is no fuel dock or bait shop on the lake, so bring what you need from town. The nearest services are in Fenton, about 20 minutes north.

Iowa fishing licenses are required for anyone 16 and older. Licenses are available online through the Iowa DNR website, at sporting goods stores, and at some convenience stores. Current regulations on walleye, pike, and bass size and bag limits change annually and are posted on the Iowa DNR website. Check before you fish to ensure you're within the rules. The lake is open year-round, but winter ice fishing requires caution—always verify ice thickness before venturing out.

When to fish Colo Lake

Spring (April through May) is the most popular season and offers the best chance at walleye. Summer (June through August) is ideal for pike and bass anglers and families fishing for panfish. Fall (September through October) brings another strong bite and fewer crowds than spring. Winter is possible for ice fishing, but conditions are unpredictable and the lake can be dangerous—only venture out if you're experienced and confident in the ice.

Weekdays are quieter than weekends, especially during spring. If you prefer solitude, fish Tuesday through Thursday. Early morning (first two hours after sunrise) and late evening (last two hours before sunset) are most productive year-round, regardless of season.

Frequently Asked Questions

What's the best bait for walleye on Colo Lake?

Live shiners, crawlers, and small minnows work best, fished on a jig-and-minnow rig or slip sinker setup. The lake's stained water means walleye hunt by smell and vibration, so live bait outperforms artificials most of the time. Fish in 6 to 10 feet of water along weed edges and shoreline structure.

Can I fish Colo Lake in winter?

Yes, ice fishing is possible, but the lake's shallow basin means ice conditions vary widely and can be unsafe. Always verify ice thickness (at least 4 inches for walking, 5 to 7 inches for small vehicles) before going out. Check with the Iowa DNR or local bait shops for current conditions before your trip.

Is there a bait shop or fuel dock at Colo Lake?

No. The lake has a boat ramp and parking but no on-site services. Bring fuel, bait, and supplies from Fenton or another nearby town. Plan ahead so you're not caught short on the water.

What size pike and walleye can I keep?

Size and bag limits change annually and vary by species. Check the current Iowa DNR regulations before you fish. Limits are posted on the Iowa DNR website and at the boat ramp.

How deep is Colo Lake?

The lake averages 8 to 10 feet deep, with a maximum depth around 18 feet. It's a shallow impoundment, so most fish are within reach of shore anglers and don't require deep-water techniques.