Union Reservoir near Longmont: Fishing Spots, Seasons and Access

• Overview

  This water sits in Weld County, Colorado. Elevation runs to 4,957 feet. The water covers around 688 acres, which puts most of it out of reach from the bank. Shoreline length is close to 4.5 miles, and each section fishes a little differently. It is among the larger waters listed here for Weld County. Longmont lies 3.1 miles from the water. Mead is 4.8 miles away, with Firestone at 7.1 miles. The county line runs close by, so rules can change within a short drive.

• Where to Fish on Union Reservoir

  No chart reached our records; the first cast is your sounding. The arms fish better than the open middle whenever the water is up. Inflow corners move water, and moving water gathers fish. County-wide records name white sucker, common carp, green sunfish, longnose sucker and bluegill. The list covers the county rather than this water alone, so treat it as a guide. Union Reservoir responds to conditions more than to tactics.

• Seasonal Patterns

  Long-term averages put July at about 72°F and January near 28°F. In milder years the surface never sets. It should never be assumed safe, whatever the month says. November and March are the quiet, comfortable months to be out. Plan around that when you fish Union Reservoir. As the season turns, fish follow food rather than temperature alone.

• Tackle & Baits

  Our records carry no access rule either way. A boat ramp sits 80 yards away, so trailered boats can get on. The nearest car park is half a mile from the water. Public data records a pier about 50 yards out. For the carp, bait a margin spot and sit on it; corn and bread still work. Ask in the nearest town if you are unsure. Some stretches are reserved and marked as such on the ground. For a change of water, Calkins Reservoir is 1.4 miles distant. Nothing on Union Reservoir should be assumed from this page alone.