In 2000, an addition to the present school was completed, adding a new library and art room.

Northern Lehigh's main sports rivalries are closely aligned with geographic proximity.

Northern Lehigh and Palmerton High School have had a strong rivalry for decades.

Since its founding, Northern Lehigh High School has won PIAA state championships in the following sports and seasons: Northern Lehigh High School has qualified for the PIAA state tournament in the following sports and years: Northern Lehigh High School has won PIAA District 11 championships in the following sports and seasons: Northern Lehigh High School joined the Colonial League in 1994.

Lyrics: Just above the winding Lehigh, Midst the mountains grand, Stands our dear old Alma Mater Famed throughout the land.