The accident happened just south of Lucky Peak, which is a little more than 10 miles southeast of the state capital in Boise, shortly after 8 p.m. local time, authorities said.
https://www.nbcnews.com/news/us-news/three-dead-national-guard-helicopter-crash-near-boise-n1256587
Lucky Peak State Park is a public recreation area covering a total of 240 acres on and near Lucky Peak Lake approximately ten miles east of Boise in Ada County, Idaho. Wikipedia
Elevation
5,904 feet
Lucky Peak sits at 5,904 feet.
https://www.idahostatesman.com/outdoors/playing-outdoors/article71294762.html
2,730′
On the Boise River in southwestern Idaho, it is 41 miles (66 km) east of the Oregon border and 110 miles (177 km) north of the Nevada border. The downtown area's elevation is 2,704 feet (824 m) above sea level. Its estimated population in 2020 was 240,380.
https://en.wikipedia.org/wiki/Boise,_Idaho
Time zone UTC−7 (MST)
• Summer (DST) UTC−6 (MDT)