That's not the norm across the US (thought it might have been for urban areas). I went to public high school in the same era in the northern VA suburbs and we

That's not the norm across the US (thought it might have been for urban areas). I went to public high school in the same era in the northern VA suburbs and we had bathrooms available. With doors even. In our 3-building campus, there were at least 6 full sets of bathrooms that I remember (so there were probably more), plus two sets of locker rooms which had toilets.