*requires off-atv hiking
![](https://blackhillsatvdestinations.com/wp-content/uploads/2024/01/FLUME-LONG-TUNNEL-1024x771.png)
![](https://blackhillsdestinations.com/wp-content/uploads/2021/01/Flume-Long-Tunnel.png)
Degrees Minutes Seconds:
Latitude: N 43 58 37
Longitude: W -103 26 37
Decimal Degrees:
Latitude: N 43.97715
Longitude: W -103.44382
GPS:
Latitude: N 43 58.629
Longitude: W -103 26.629
UTM:
13N 624814 4870512
Trailhead:
Pine Grove Trailhead