Mountains, trails & views in Union
About 8.3% of Union is conserved land, roughly 7,490 acres. There are about 5.1 miles of mapped trails.
What kind of outdoors town is Union?
Read from the map. The page puts what stands out first.
Conserved land, trails & bike routes
Tap a number to zoom to a park. Tap a layer to hide it.
1 places to go in Union
Beaches, playgrounds, peaks, falls and more. Pick a kind.
1 lakes & rivers
7,490 conserved acres
Who manages Union’s conserved land, from the USGS Protected Areas Database. Approximate, because parcels can overlap.
| Place | Managed by | Acres | Public access |
|---|---|---|---|
| Sd Public Land State Resource Management Area | State land board | 7,293 | Open |
| South Dakota Field Office National Public Lands | Bureau of Land Management | 197 | Open |
0.0 miles of bike routes
Bike lanes are often missing from the map in smaller towns, so that number is likely low.
Includes school and college facilities, which aren’t always open to the public.
Trail talk
Conditions, parking and favorite walks from Union neighbors.
Trails, parks, preserves, courts and bike lanes © OpenStreetMap contributors (ODbL), map data as of 2026-09-28. Conserved land: USGS Gap Analysis Project, PAD-US. Measured against the Census town boundary.
How we measure
"Trails" are OpenStreetMap paths, bridleways, public tracks and unpaved footways, plus footways inside a park or preserve or on a named trail route. Sidewalks are left out. Areas are counted on a 38.7-meter grid, so overlapping parcels count once. "Conserved" includes conservation easements, which protect land from development but are usually private property. Trailheads are the nearest marked trailhead, public parking lot or information board within about 150 meters of a preserve. Dog rules come from OpenStreetMap when someone has tagged them; otherwise we show what’s typical for the land manager, or say the rules aren’t recorded.