What You'll Find at O'Shaughnessy Reservoir

O'Shaughnessy Reservoir is a 2,250-acre impoundment on the Scioto River just north of Columbus, built in 1925 as a water supply for the city. The lake holds walleye, channel catfish, flathead catfish, and largemouth bass, with walleye and catfish drawing most of the fishing pressure. The water is relatively clear in summer and fall, and the lake has a mix of shallow flats, deeper channels, and rocky structure that changes character depending on which arm you're fishing.

The reservoir is managed by the City of Columbus Division of Water, and fishing is open year-round with a valid Ohio fishing license. Public access is limited compared to state-run lakes—there is one primary boat launch at the north end near the dam, and bank access is restricted to certain areas. The lake sits in an urban setting, so expect to see other boats and anglers, especially on weekends and during the walleye bite in spring and fall.

Key Takeaways

  • Walleye fishing peaks in spring (April–May) and fall (September–October), with the best bite occurring at dawn, dusk, and night.
  • Channel and flathead catfish are present year-round; summer and early fall are prime seasons, and live shiners or cut bait work well.
  • The single public boat launch is at the north end near the dam; arrive early on weekends to secure a spot.
  • Water levels fluctuate seasonally because the reservoir is a municipal water supply, which affects structure and fish location.
  • Largemouth bass are present but less abundant than walleye and catfish; spring spawning season offers the best opportunity.

Walleye Fishing Seasons and Techniques

Spring walleye fishing at O'Shaughnessy runs from late March through May, with the peak bite typically occurring in April and early May as water temperatures climb from the mid-40s to the mid-50s. Fish the shallow flats and rocky structure near the dam and along the main river channel during this period. Jigs tipped with live minnows or soft plastics work well; cast toward structure and work the lure slowly along the bottom. Early morning and late evening produce the most consistent results, though overcast days can extend the bite into midday.

Fall walleye fishing begins in September and runs through October as water temperatures drop back into the 50s and 60s. The bite is often more aggressive than spring, and fish move into slightly deeper water—the main channel and drop-offs become productive. Trolling crankbaits along the channel edges or casting jigs in 12 to 20 feet of water will put fish in the boat. Night fishing with live shiners under lights can be effective, though the reservoir's urban location means fewer anglers pursue this method than on rural lakes.

Winter fishing (November through February) is possible but slower. Walleye move to the deepest holes and are less active. If you fish winter, focus on the main channel near the dam in 25 to 35 feet of water, and fish slowly with live minnows or small jigs. Many anglers shift to catfish during these months instead.

Catfish: Channel and Flathead

Channel catfish are abundant at O'Shaughnessy and bite consistently from May through October. Fish the deeper holes and channel structure with cut shad, chicken liver, or live shiners. Catfish are not picky about time of day, though early morning and evening often produce more fish. A simple three-way rig with a sinker and a short leader to a circle hook works well and reduces the chance of deep hooking. Expect fish in the 2 to 8-pound range, with occasional larger specimens.

Flathead catfish have become more common in recent years. These fish are nocturnal and aggressive predators, so fish for them after dark with live shiners or small bluegill. Use heavier tackle—flatheads can exceed 40 pounds—and fish the deeper structure near the dam and main channel. A single large live bait on a heavy jig head or slip sinker rig will attract flatheads more effectively than multiple smaller baits. Flathead season runs June through September, with July and August typically the most productive months.

Access, Facilities, and Launch Information

The primary public boat launch is located at the north end of the reservoir near the dam, accessible from Riverside Drive. The launch has a paved ramp, parking for roughly 40 vehicles, and a small picnic area. There is no fee to launch, but the lot fills quickly on weekend mornings, especially during spring and fall. Arrive by 7 a.m. on Saturday or Sunday if you want to be certain of a spot.

Bank fishing access is limited. The area immediately around the dam allows some shore fishing, and there are a few pull-offs along the eastern shore, but much of the shoreline is private or restricted. Call the City of Columbus Division of Water at (614) 645-7377 if you have questions about access or current conditions. There are no rental boats or guide services based on the reservoir itself, though several Columbus-area tackle shops can point you toward local guides who fish the lake.

Water Levels and Seasonal Changes

O'Shaughnessy is a municipal water supply, so water levels rise and fall based on Columbus's water demand and seasonal rainfall. Levels are typically highest in spring (March–May) and lowest in late summer and early fall (August–September). These fluctuations affect where fish hold and how accessible shallow structure becomes. In low-water periods, some shallow flats that hold fish in spring may be too shallow to reach safely with a boat.

The dam itself creates a significant depth change—the water is shallow and flats-like upstream from the dam, then drops off sharply near the structure. Fish often concentrate along these transition zones, especially during periods of water level change. Check with local tackle shops or the Division of Water for current levels before you fish, as this information can help you plan which areas to target.

Largemouth Bass and Other Species

Largemouth bass are present at O'Shaughnessy but are less abundant than walleye and catfish. Spring spawning season (April–May) is the best time to target them, when fish move into shallow water and become more aggressive. Fish shallow cover—fallen trees, weed edges, and rocky banks—with soft plastics or topwater lures. Early morning and late evening are most productive. Summer bass fishing is slower, as fish move to deeper, cooler water and become less active.

Crappie and bluegill are also present in smaller numbers and can provide good panfish action in spring and early summer, especially around submerged structure and fallen trees. These fish are not the primary draw at O'Shaughnessy, but they offer a secondary option if walleye and catfish are not cooperating.

Tackle Shops and Local Resources

Several tackle shops in Columbus stock gear suited to O'Shaughnessy fishing. Jig heads, live minnows, cut bait, and crankbaits are standard stock items. Local shops can also provide current bite reports and information about water levels. The Ohio Division of Wildlife website has general information about the lake, including fish stocking records and regulations.

Before you fish, confirm current regulations on size and bag limits, as these can change year to year. The Division of Water also maintains information about water quality and any temporary closures or restrictions that might affect your trip.

Frequently Asked Questions

What is the best time of year to fish O'Shaughnessy?

Spring (April–May) and fall (September–October) are peak seasons for walleye. Summer is best for catfish. Winter fishing is slower but possible if you target the deepest holes. The lake fishes year-round, so the best time depends on which species you want to pursue.

Do I need a boat to fish O'Shaughnessy?

A boat gives you access to most of the productive water, but some bank fishing is possible near the dam and along the eastern shore. Bank access is limited, so a boat is strongly recommended if you want consistent fishing opportunities.

What size fish can I expect?

Walleye typically range from 12 to 18 inches, with occasional fish over 20 inches. Channel catfish run 2 to 8 pounds, and flatheads can exceed 40 pounds. Largemouth bass are generally 12 to 16 inches. These are averages—individual fish vary.

Is there a fee to launch at O'Shaughnessy?

No, launching is free. There is no daily fee or permit required beyond a valid Ohio fishing license. Parking is available at the north-end launch, though the lot fills on busy weekends.

Can I fish at night?

Yes, night fishing is allowed. Walleye and flathead catfish often bite better after dark. Bring a headlamp and use caution when navigating the lake at night, especially if you are unfamiliar with the structure.