Nadeau played in the 2018-19 [1] season for the North West Bulls Bantam of the New Brunswick Bantam AAA Hockey League (NBBAAAHL), raking in 44 points on 21 goals and 23 assists in 27 games, placing him 3rd in the points standings at the end of the season. Nadeau returned for the 2019-20 [2] season, this time scoring 78 points on 35 goals and 43 assists in just 27 games, leading the league in assists, points, and points per game (2.89). Nadeau was included in the First All-Star team for the NBBAAAHL in the 19-20 season, and won the regular season MVP award. During the 2022–23 season, Nadeau led the Penticton Vees to their second consecutive Fred Page Cup championship awarded to the British Columbia Hockey League (BCHL) playoff winner. He led the league in scoring with 113 points on 45 goals and 68 assists in 54 games and added 17 goals and 18 assists in 17 playoff games. He led the league in goals, assists, points-per game (2.09), power-play goals (18) and game-winning goals (10). Following an outstanding season he was awarded the Brett Hull Trophy, as the league's top scorer, the Vern Dye Memorial Trophy, as regular season MVP, and the Jeff Tambellini Trophy as playoff MVP.[1] Nadeau was selected in the first round, 30th overall, by the Carolina Hurricanes in the 2023 NHL Entry Draft.[2]
Nadeau's father, John, played ice hockey for the Haut-Madawaska Panthères in the New Brunswick Regional Hockey League senior men's league before retiring in 2022. Bradly's older brother, Josh, is also an ice hockey player at Maine.[9][10]