Rio Grande: Border River Bass and Catfish Country
The Rio Grande runs 3,051 kilometres from its headwaters in Colorado's San Juan Mountains to the Gulf of Mexico, forming the entire land border between Texas and Mexico for most of its lower course. It is a river of extremes: bone-dry in its upper reaches after irrigation diversions, swelling into wide, muddy floodplains south of Albuquerque, then narrowing into the sheer limestone chasms of Big Bend before widening again into the lake-like impoundments along the Texas border. For anglers, the lower Rio Grande is defined by two massive reservoirs — Falcon and Amistad — and by the wild catfish reaches of the river's canyon sections.
Falcon Lake: Largemouth Bass Records
Falcon Reservoir was created in 1953 by the Falcon Dam, a joint US-Mexico project located 130 kilometres south of Laredo. At full pool it covers about 280 square kilometres, with the international boundary running through its middle. The lake became globally famous for largemouth bass in the 1990s and early 2000s when Texas Parks and Wildlife began stocking Florida-strain largemouth, which grow significantly larger than native northern-strain fish given the warm climate and abundant shad forage. Fish exceeding 13 pounds became almost routine for skilled anglers, and specimens in the 15- to 18-pound range showed up frequently enough to attract tournament circuits. The structure is extraordinary: flooded timber lines the coves, old river channels form defined drop-offs at 6 to 9 metres, and submerged brush piles hold bass year-round. January through March is the prime season, when pre-spawn bass are in the shallows and water temperatures hover between 15°C and 20°C. Swimbaits in the 20 to 25 centimetre range, slow-rolled over the timber, produce the biggest fish; creature baits on Texas-rigged heavy weights cover the deep brush.
Amistad Reservoir: Striped Bass and Smallmouth
Amistad Reservoir, formed by Amistad Dam near Del Rio, is the larger of the two border impoundments, covering roughly 260 square kilometres at full pool. While largemouth bass are present, Amistad is best known for its striped bass fishery. Landlocked stripers were introduced and have adapted exceptionally well to the deep, clear water. Fish of 5 to 9 kilograms are common, and occasional specimens push 14 kilograms. The key is finding the shad schools that the stripers herd into the surface — look for diving pelicans and cormorants over the main lake basin in October and November. Topwater lures, particularly the Heddon Zara Spook and 15-centimetre Storm swimming shad, produce explosive strikes during these baitfish pushes. Below the dam, the Rio Grande flows cold and clear for 30 kilometres before warming again, and this tailwater supports a surprising brown trout population — a rarity in the Texas heat.
Catfish in the Wild Canyon Stretches
Between Presidio and Langtry, the Rio Grande enters some of the most remote canyon territory in the lower 48. The river flows through Santa Elena Canyon (where the Mexican wall of rock rises 480 metres directly from the water), Mariscal Canyon, and Boquillas Canyon within Big Bend National Park — reaches accessible only by canoe or raft. These stretches hold blue catfish averaging 4 to 10 kilograms, with trophy fish exceeding 20 kilograms taken in the deeper pools below canyon walls. Channel catfish are equally present in the shallower riffles. Bait fishing with cut shad or chicken liver anchored on a slip sinker is the standard approach; the structure-rich pools hold fish reliably from April through October. Night fishing from a parked canoe in the Santa Elena stretch is a genuinely memorable experience — the 480-metre walls block the horizon and the stars are spectacular above the narrow slit of sky.
Trophy Largemouth Techniques at Falcon
Falcon Lake's biggest bass demand specific techniques. The Texas rig with a 10- to 14-inch straight tail worm (watermelon red or junebug colours) is the all-season staple. In February and March, when water temperatures cross 18°C, big females move into 1- to 2-metre-deep hydrilla flats and respond to a slowly crawled creature bait or a weightless senko. The lake's Mexican side (accessible with the proper international fishing permit) sometimes produces less-pressured fish in the coves near Guerrero. Guides operating from the Falcon State Park and the town of Zapata have the necessary knowledge of structure, permit requirements, and current water conditions — the lake's level fluctuates dramatically with drought cycles, and productive structure shifts accordingly.
Rio Grande Smallmouth in the Pecos Confluence
Where the Pecos River meets the Rio Grande near Langtry, a unique cold-water influence creates smallmouth bass habitat rare for this latitude. Fish of 1 to 2 kilograms frequent the rocky ledges and gravel bars at this confluence, responding to ned rigs, small tube baits, and in-line spinners. The access is via rough ranch roads managed by the Texas Department of Transportation's historical marker sites, and wading this clear, rocky reach on an October morning feels like fishing a hundred years ago.
Licenses and Regulations
Texas requires a freshwater fishing license for all anglers 17 and older; licenses cost approximately $40 for residents and $63 for non-residents annually. An endorsement is required for bass tournaments. Fishing Falcon Lake on the Mexican side requires a Mexican fishing permit obtainable through official CONAPESCA outlets; some guides arrange these permits as part of their service. Big Bend National Park requires a free backcountry permit for overnight canoe trips and prohibits bank fishing in most riverside areas without prior authorization.
When to Fish
Falcon Lake bass: January through March for trophy pre-spawn fish; October and November for schooling activity. Amistad stripers: October and November for surface blowups. Rio Grande catfish in the canyons: May through September for warmwater feeding. The Pecos confluence smallmouth: September through November for the clearest water and most active fish.
Explore on the Map
The Rio Grande's fishing diversity — from tournament bass at Falcon to canyon catfish in Big Bend — spans several hundred kilometres of Texas borderlands. Browse the full interactive map to trace the river's course from its headwaters south through the impoundments, and use the map to locate the Rio Grande on the map to identify exact reservoir positions, canyon entry points, and the Pecos confluence. Falcon State Park and Amistad National Recreation Area maintain current launch ramp information that the map layers complement well.