Question: What stadium did the 1997 Montana Grizzlies football team play at that was opened in 1986?

Context paragraphs:
2017 Montana Grizzlies football team: The 2017 Montana Grizzlies football team represents the University of Montana in the 2017 NCAA Division I FCS football season.  The Grizzlies are led by third-year coach Bob Stitt and play their home games on campus at Washington–Grizzly Stadium in Missoula, Montana as a charter member of the Big Sky Conference.

Washington–Grizzly Stadium: Washington–Grizzly Stadium is an outdoor athletic stadium in Missoula, Montana, located on the campus of the University of Montana.  Opened in 1986, it is home to the Montana Grizzlies college football team, a dominant program of the Big Sky Conference and consistently a top team in Division I FCS, formerly known as "Division I-AA".  The infilled SprinTurf playing field is 20 ft below ground level at an elevation of 3190 ft above sea level and runs in the traditional north–south orientation.  The press box is above the west sideline and lights were added for the 2012 football season.  It is the largest all-purpose stadium in the state of Montana.

2016 Montana Grizzlies football team: The 2016 Montana Grizzlies football team or better known as the team that lost to the worst team in the Big Sky UNC, represented the University of Montana in the 2016 NCAA Division I FCS football season.  The Grizzlies were led by second-year coach Bob Stitt and played their home games on campus at Washington–Grizzly Stadium.  Montana participated as a member of the Big Sky Conference, of which they are a charter member.  They finished the season 6–5, 3–5 in Big Sky play to finish in eighth place.

1982 Montana Grizzlies football team: The 1982 Montana Grizzlies football team represented the University of Montana in the 1982 NCAA Division I-AA football season as a member of the Big Sky Conference.  The Grizzlies were led by third-year head coach Larry Donovan, played their home games at Dornblaser Field and finished the season with a record of six wins and six losses (6–6, 5–2 Big Sky) as the Big Sky Conference champions.  Tied with Idaho and Montana State at the top of the league standings, Montana defeated both to win the tie-breaker and title.

2014 Montana Grizzlies football team: The 2014 Montana Grizzlies football team represented the University of Montana in the 2014 NCAA Division I FCS football season.  The Grizzlies were led by head coach Mick Delaney in his third and final year and played their home games on campus at Washington–Grizzly Stadium.  Montana participated as a member of the Big Sky Conference, of which they are a charter member.  They finished the season 9–5, 6–2 in Big Sky play to finish tied for second place.  They received an at-large bid to the FCS Playoffs where they lost in the second round to inter conference rival Eastern Washington.

2013 Montana Grizzlies football team: The 2013 Montana Grizzlies football team represented the University of Montana in the 2013 NCAA Division I FCS football season.  The Grizzlies were led by second-year head coach Mick Delaney and played their home games on campus at Washington–Grizzly Stadium.  Montana participated as a member of the Big Sky Conference, of which they are a charter member.  They finished the season 10–3, 6–2 in Big Sky play to finish in third place.  They received an at-large bid to the FCS Playoffs where they lost in the second round to Coastal Carolina.

2012 Montana Grizzlies football team: The 2012 Montana Grizzlies football team represented the University of Montana in the 2012 NCAA Division I FCS football season.  The Grizzlies were led by first-year head coach Mick Delaney and played their home games on campus at Washington–Grizzly Stadium.  Montana is a charter member of the Big Sky Conference.

1997 Montana Grizzlies football team: The 1997 Montana Grizzlies football team represented the University of Montana in the 1997 NCAA Division I-AA football season.  The Grizzlies were led by second-year head coach Mick Dennehy and played their home games at Washington–Grizzly Stadium.

1986 Montana Grizzlies football team: The 1986 Montana Grizzlies football team represented the University of Montana in the 1986 NCAA Division I-AA football season as a member of the Big Sky Conference (Big Sky).  The Grizzlies were led by first-year head coach Don Read, played their home games at Dornblaser Field and Washington–Grizzly Stadium, and finished the season with a record of six wins and four losses (6–4, 4–4 Big Sky).

2015 Montana Grizzlies football team: The 2015 Montana Grizzlies football team represented the University of Montana in the 2015 NCAA Division I FCS football season.  The Grizzlies were led by first-year coach Bob Stitt who took over after 15 years coaching the NCAA Division II Colorado Mines Orediggers.  The Grizzlies played their home games on campus at Washington–Grizzly Stadium.  Montana participated as a member of the Big Sky Conference, of which they are a charter member.  They finished the season 8–5, 6–2 in Big Sky play to finish in a tie for second place.  They received an at-large bid to the FCS Playoffs where they defeated South Dakota State in the first round before losing in the second round to North Dakota State.

Supporting paragraphs: 1997 Montana Grizzlies football team Washington–Grizzly Stadium
Answer: Washington–Grizzly Stadium