The Schlossbach rises below the Reither Spitze in the municipality of Reith bei Seefeld and flows in a north to south direction. After around it collects the river Grieskarbach from the left. In its upper reaches is a gorge, the Schlossbachklamm (location: ). This is traversed at a height of by the Schlossbach Bridge which carries the track of the Mittenwald Railway. The railway bridge is a , trussed arch structure made of steel and a popular photograph subject.