From Hartland, Route 104 follows the Becaguimec Stream to the north traveling east through the communities of Coldstream at the south terminus of Route 570, Lower Windsor at the south terminus of Route 580 before turning south east.
From Hartland, Route 104 follows the Becaguimec Stream to the north while traveling east through the communities of Coldstream at its southern endpoint on Route 570, Lower Windsor at its southern endpoint on Route 580 before turning southeast.