What You'll Find in the Knife River

The Knife River is a warm-water fishery in west-central North Dakota that holds walleye, northern pike, and smallmouth bass. The river flows roughly 60 miles from its headwaters near Mandaree south to the Missouri River near Stanton. Most of the productive water lies between the town of Hazen and the confluence with the Missouri, where the channel deepens and current slows enough to hold fish year-round.

The Knife is not a destination river in the way the Missouri or Yellowstone are, but it rewards local anglers and travelers who know how to read it. Water clarity varies sharply depending on recent rainfall and snowmelt — after heavy runoff the river turns tan or brown, but in stable conditions it clears to 2 to 4 feet of visibility. Summer temperatures can exceed 75 degrees, which pushes walleye and pike into deeper holes and current breaks during midday.

Key Takeaways

  • Walleye fishing peaks in spring (April through May) and fall (September through October) when fish move into shallower water and feed actively.
  • Northern pike are present year-round but are most catchable in spring and early summer when they hunt in weedy shallows and backwater areas.
  • Access is limited to a few public boat ramps and walk-in points; the river corridor is mostly private land, so respect posted boundaries.
  • North Dakota fishing licenses are required for all anglers 16 and older, and the Knife River has specific daily bag limits for walleye and pike that change by regulation period.
  • Water levels fluctuate with snowmelt and dam releases upstream; call ahead to confirm conditions before making the drive.

Spring Walleye Season and Access Points

Spring is the most reliable time to fish walleye on the Knife River. From mid-April through May, walleye move into shallower flats and current breaks to spawn and feed. Target depths of 6 to 12 feet along the main channel and in the transition zones where the river widens into slack water. Live minnows (shiners or chubs, 3 to 4 inches) under a slip bobber work well, as do jigs tipped with minnow or crawfish.

The primary public access point is the Hazen Boat Ramp, located off Highway 200 near the town of Hazen. This ramp provides parking and a concrete launch into the main channel. From Hazen, you can drift or motor downstream toward Stanton, a distance of roughly 30 miles. Another access point exists near Stanton at the confluence with the Missouri River, though this area is more exposed to wind and current. Both ramps require a North Dakota fishing license and are free to use.

Water levels in spring are often high due to snowmelt and dam releases from upstream impoundments. The river can run fast and discolored in April, which actually concentrates walleye in deeper holes and behind current breaks. By late May, as flows stabilize, fish spread out and become harder to locate. Plan your trip for mid-April through early May for the best combination of active fish and manageable water conditions.

Northern Pike in Backwater and Weed Growth

Northern pike inhabit the Knife River year-round but are most aggressive in spring and early summer when water temperatures range from 50 to 65 degrees. Pike hunt in shallow, weedy backwater areas and along the outside bends of the main channel where current slows. Look for pike in water 4 to 8 feet deep near submerged brush, fallen trees, or dense aquatic vegetation.

Casting large swimbaits (4 to 6 inches), spinnerbaits, or topwater plugs will draw strikes from pike. Live baitfish (4 to 6 inch shiners or suckers) fished under a bobber in backwater pockets also produces consistent results. Pike in the Knife are not typically large — most fish run 18 to 26 inches — but they are abundant and willing. The river's warm water and abundant forage support a healthy pike population, though trophy fish are rare.

Summer pike fishing slows as water temperatures climb above 70 degrees. Fish retreat to deeper, cooler holes and become less active during daylight. If you fish for pike in June, July, or August, focus on early morning and evening hours, and fish deeper structure along the main channel.

Smallmouth Bass and Summer Conditions

Smallmouth bass are present in the Knife River but are not the primary target for most anglers. They inhabit rocky areas, current breaks, and deeper holes throughout the river. Summer is the best season for smallmouth, when they are most active in warm water. Fish jigs, crankbaits, or soft plastics around structure in 8 to 15 feet of water.

The Knife River's warm-water character — water temperatures regularly exceed 75 degrees in July and August — makes it less ideal for coldwater species like trout. Smallmouth thrive in these conditions, but walleye and pike become lethargic and harder to catch. If you are targeting smallmouth in summer, fish early morning or late evening when water temperatures are slightly lower and fish are more active.

Fall Fishing and Water Level Changes

Fall (September through October) is the second-best season for walleye on the Knife River. As water temperatures drop from the summer peak, walleye become active again and move into shallower water to feed before winter. The same spring tactics — live minnows under a bobber, jigs, and small crankbaits — work well in fall. Water clarity often improves in fall as summer runoff ends and the river stabilizes.

Fall water levels are typically lower and more stable than spring, making navigation easier and fishing more predictable. However, water temperature drops quickly in October, and by late fall the river becomes difficult to fish as walleye move into the deepest holes and feed less frequently. Plan a fall trip for mid-September through mid-October for the best results.

Winter fishing on the Knife River is possible but limited. The river does not freeze solid in most years, but ice forms along the banks and in backwater areas. Some anglers fish through the ice in shallow bays, but access becomes difficult and conditions are unpredictable. Most anglers avoid the Knife in winter and focus on other North Dakota waters.

Regulations, Licenses, and What to Bring

All anglers 16 years old and older must carry a valid North Dakota fishing license. Licenses are available online through the North Dakota Game and Fish Department website, at sporting goods stores, or at the Hazen Boat Ramp. A one-day license costs less than a full-season license and is a good option if you are visiting for a short trip.

The Knife River has specific daily bag limits and size restrictions that vary by regulation period. As of the most recent regulations, walleye have a daily limit of 5 fish with a 15-inch minimum size, and northern pike have a daily limit of 3 fish with a 24-inch minimum size. Regulations change annually, so check the current North Dakota fishing guide before you fish. Smallmouth bass have a 12-inch minimum size and a daily limit of 5 fish.

Bring a current map of the river, a GPS unit or smartphone with offline maps loaded, and a radio or cell phone for communication. Water conditions can change rapidly, and the river corridor is remote in places. Tell someone where you are going and when you expect to return. Wear a personal flotation device at all times while boating, and carry extra fuel — the nearest gas station may be 20 miles away.

Planning Your Trip and Nearby Services

The town of Hazen is the closest service hub to the Knife River, located about 5 miles north of the Hazen Boat Ramp. Hazen has a small grocery store, a gas station, and a few restaurants, but no dedicated fishing lodges or guide services. Mandan, about 40 miles south, offers more amenities including hotels, restaurants, and tackle shops. The Knife River is a day-trip destination for most anglers rather than a multi-day stay.

Water levels on the Knife River fluctuate with snowmelt in spring and dam releases from upstream impoundments. Call the North Dakota Game and Fish Department or check their website for current conditions before you make the drive. High water in spring can make the river difficult to navigate, while low water in late summer can strand boats on sandbars. Stable conditions typically occur from mid-May through August and again in September and October.

The Knife River is open to fishing year-round, but the best fishing occurs during spring (April through May) and fall (September through October). Summer is warm and slow, and winter is difficult to access. Plan your trip during one of these two windows for the best combination of active fish and manageable conditions.

Frequently Asked Questions

Do I need a guide to fish the Knife River?

No guide service is required, and the Knife River does not have a strong guide industry. The river is straightforward to navigate if you have basic boating skills and a map. Public access is limited to a few ramps, so most anglers fish from the Hazen Ramp and drift or motor downstream. If you are unfamiliar with the river, ask locals at the ramp or at the Hazen gas station for current conditions and productive areas.

What is the best bait for walleye on the Knife River?

Live minnows (shiners or chubs, 3 to 4 inches) are the most reliable bait. Fish them under a slip bobber in 6 to 12 feet of water, or use them on a jig head. Crawfish and leeches also work, but minnows are easier to find and more consistent. Artificial lures like small crankbaits and jigs tipped with soft plastics also produce walleye, especially in fall when fish are aggressive.

Can I fish the Knife River in winter?

Winter fishing is possible but difficult. The river does not freeze solid in most years, and some anglers fish through the ice in shallow bays. However, access is limited, water levels are low, and fish are inactive. Most anglers avoid the Knife in winter and fish other North Dakota waters instead. If you do fish in winter, check with the Game and Fish Department for current conditions and access information.

What size boat do I need for the Knife River?

A 16 to 18-foot aluminum boat with a 40 to 60-horsepower outboard is ideal for the Knife River. The river has sandbars and shallow areas, so a boat with a shallow draft and trim-able motor is helpful. Smaller boats (14 feet) can work in stable water conditions, but larger boats may run aground in low water. Check current water levels before launching, and be prepared to navigate around sandbars and debris.

Are there any restrictions on where I can fish on the Knife River?

Most of the Knife River corridor is private land. Respect posted "No Trespassing" signs and do not wade or fish from private property without permission. Public access is limited to the Hazen Boat Ramp and a few other designated areas. The river itself is open to fishing from a boat, but you cannot land on private banks or wade through private property to reach the river.