Virginia’s New River in Giles County and the James River from Glasgow to Scottsville produce some of the East Coast’s best March smallmouth fishing, with pre-spawn bass feeding aggressively in 46–52°F water while most northern smallmouth rivers remain icy or closed. Both rivers hold dense populations of wild smallmouth — including fish over 20 inches — and see almost zero fishing pressure in early spring. The key is targeting the narrow temperature window when bass move out of deep wintering holes and into transitional structure, feeding heavily on crayfish and baitfish before the late-April spawn.
Best Water Temperatures and Timing for March Smallmouth
Smallmouth activity on both rivers hinges on water temperature climbing through the mid-40s°F. Below 40°F, bass hold deep and feed minimally. But once temperatures reach 46–48°F — typically mid- to late March — metabolism spikes and pre-spawn feeding begins in earnest. New River guide Britt Stoudenmire calls this the optimal window, noting that bass can scatter and become selective once water passes 50°F.
Timing within the day matters just as much. Cold March nights keep morning water temperatures low, and the best fishing consistently happens from mid-morning through late afternoon as sun warms the shallows. Flats and banks that appear lifeless at 9 a.m. often hold actively feeding bass by 2 p.m. Plan floats around the warmest hours rather than launching at dawn.
Watch for stable warming trends — three to four consecutive mild, sunny days tend to trigger the strongest feeding activity. A sudden cold snap or major flood can delay the bite, but don’t write off high water entirely. Rising flows dislodge crayfish from their burrows and push smallmouth into flooded shoreline cover where they feed aggressively and are easier to locate.
Flies and Rigging for Cold-Water Smallmouth
Crayfish imitations are the most important fly category for March smallmouth on both rivers. Chuck Kraft’s Clawdad in size 4–6 (brown, olive, or rusty orange) was developed specifically for Virginia water and fished with a slow crawl-and-hop retrieve remains a top producer. Clouser Minnows in size 2–4 — olive/white in clear water, chartreuse/white in stained flows — cover the baitfish side of the equation. Murray’s Hellgrammite in size 6, dead-drifted near bottom, rounds out the essential box.
Rig a 7- or 8-weight rod with a 250-grain full-sinking line for boat fishing in higher flows. Use a short, stout leader — four to six feet of 0X to 2X fluorocarbon. The universal rule for March presentation: slow down, then slow down again. Most strikes come on the pause, and what feels uncomfortably slow is usually about right in 47°F water.
Where to Float and Access Both Rivers
The New River’s prime March water runs from Eggleston to Pembroke (6 miles) and Rich Creek to Glen Lyn (5 miles), with multiple DWR access points. Portage or avoid Narrows Falls — a dangerous seven-foot ledge drop — and never float past Glen Lyn into West Virginia, where Shumate Falls creates a fatal hazard…