Be honest about why people come
Most people on the Niobrara are floating it, not fishing it. The National Scenic River, designated May 24, 1991, covers 76 miles from Borman Bridge near Valentine down to State Highway 137, plus a lower reach from the western Knox County line to the Missouri and the bottom of Verdigre Creek. The Park Service says most visitors come to float by canoe, tube, kayak or raft, and the federal river summary talks about tens of thousands of floaters a year, with a party atmosphere on many summer Saturdays below the refuge. The Fish and Wildlife Service puts it plainly for the Fort Niobrara stretch: the river through the refuge is not known as a high-value fishery.
So set expectations. This is a shallow, fast, sand-and-rock river in a narrow canyon, beautiful and worth the trip, where fishing is something you do from the canoe or on an off day rather than the reason to drive to Valentine. Go on a weekday or a Sunday if you want quiet water, which is also the Park Service's own advice.
What is actually in the river
The Park Service calls the Niobrara the most species-diverse river in Nebraska. Channel catfish are the main event, in slow, shaded water with cover; flatheads and blue catfish also turn up. Largemouth and smallmouth bass hold around shallow cover, and the Park Service suggests releasing them, noting a mercury consumption advisory on largemouth in the Niobrara basin and higher-than-average mercury in black crappie. White and black crappie, northern pike, carp, sauger, grass pickerel and river carpsucker round out the list.
Downstream of the scenic canyon the lower segment is a braided sand river with backwaters, chutes and islands; it holds nesting habitat for least terns and piping plovers, and the endangered pallid sturgeon has been recorded there. Any sturgeon you hook goes straight back.
Nebraska limits, federal bait rules and private banks
State rules apply on the whole river. On flowing water, channel catfish are ten a day and twenty in possession with no minimum, but only one may be 30 inches or longer; flatheads are five a day with the same one-over-30 rule; blue catfish are one a day. Black bass on inland waters carry a 15-inch minimum, five a day in aggregate, and only one may be 21 inches or longer. A Nebraska license is required from age 16, and the Park Service lists the Valentine State Fish Hatchery, the Sinclair station and Wright's Bait Shop as places to buy one.
Bait is where it gets confusing. The Park Service's fishing page recommends live bait caught from the river for catfish, yet the same page lists the federal rule against possessing or using live or dead minnows and other baitfish except in designated waters, and it asks anglers not to collect northern redbelly dace, finescale dace, blacknose shiner or Topeka shiner. On Fort Niobrara refuge, collecting baitfish, frogs and turtles is prohibited outright and limb or set lines are banned. Worms, cut bait from legally caught fish and artificials avoid the question; call the park at 402-376-1901 if you plan to use minnows. Much of the corridor is private, so get permission before fishing from any bank you did not launch from.
The refuge reach below Cornell Dam
On Fort Niobrara National Wildlife Refuge you may fish the river only downstream of Cornell Dam and on Minnechaduza Creek, from legal sunrise to legal sunset; everything upstream of the dam is closed to the public. Floaters on the refuge need a wristband from the kiosk at the launch, and craft are limited to four people. The Park Service calls this stretch a quieter float that also lets you hike into a federal wilderness area. Farther downriver, Smith Falls State Park, with Nebraska's highest waterfall at 65 feet, and the Borman Bridge and Fred Thomas wildlife management areas give additional public access.
A gauge that barely moves
The Sparks gauge sits on the canoe stretch east of Valentine, and its record is unusually steady for a plains river: monthly means only range from about 581 cfs in August to 1,015 in March. The federal river summary describes Ogallala aquifer water seeping out of the canyon walls as springs and waterfalls, which is the kind of steady feed that keeps a river from swinging. No outfitter or agency publishes a fishing range, and the Park Service simply offers daily cfs by phone, so the 550 to 1,000 cfs band here is the normal range of that record. Well above it, look for a storm upstream before you launch.
In the three weeks before September 24, 2026 the gauge ran 534 to 873 cfs and read about 647 on the 24th, right in its usual late-summer range. The Verdel gauge near the mouth reads the lower braided reach.
Catfish and bass by season
The seasonal table below is general plains-river timing, not something published for the Niobrara: bass on minnow patterns and crayfish from late spring through early fall, topwater in midsummer, and catfish on worms and cut bait from May through September.