The Pasadena, Maryland, native is the highest-ranked player in the Terps' 2021 class.
With strong recruits poised to join the squad in 2021 and 2022, the Terps are hopeful their growing pains will be short-lived.
Bam's older brother, Anthony, is a redshirt freshman defensive lineman for the Terps.
He previously committed to LSU in December.
The three-star product joins the Terps from nearby St. John's College High School.
Lewandowski racked up 2,804 yards and 28 touchdowns in 10 games for Wisconsin-La Crosse last season.
Bradley is Maryland's 11th recruit — all of whom hail from Maryland, Washington D.C. or Virginia.
The Gaithersburg native becomes the Terps' highest-rated class of 2021 recruit.
Smart is Maryland's second 2020 commit, joining three-star Marcus Dockery.
Defensive back Osita Smith, offensive lineman Amelio Moran and defensive lineman Almosse Titi all signed Wednesday.