We established a long-term, ultrasonic acoustic monitoring site on Private lands in central Montana (Figure 1), following deployment and maintenance protocols in Maxell (2015). The detector was placed adjacent to a large lentic waterbody (Figure 2). The surrounding area was not forested and topographically rugged.
A SM3 detector with a SMM-U1 microphone was deployed on 08 Jun 2015 and decommissioned on 13 Dec 2017, for a total of 920 nights deployed. Throughout the recording period the detector functioned well, recording on 832 nights or 90.4% of the time. In total this unit collected data over 31 months and met our minimum of 2 years of deployment for analysis of long-term trends.