 m-103 is a state trunkline highway entirely within st. joseph county in the southwestern region of the u.s. state of michigan. the trunkline runs between u.s. highway 12 (us&nbsp;12) in mottville and the indiana state line along undivided highway near the st. joseph river. with the connection to state road 15 (sr&nbsp;15), it provides access to the indiana toll road. the current highway is the second to carry the number; the first version of m-103 has been incorporated into the routing of us&nbsp;131. ==route description== m-103 is the continuation of sr&nbsp;15 in michigan. it starts at state line road which runs along the state line east from m-103. from here north to the terminus in mottville, m-103 parallels the st. joseph river running through farmlands. south of town, it runs past the mottville township cemetery. between john and water streets, m-103 intersects and ends at us&nbsp;12. the highway has not been listed on the national highway system, a system of roads important to the country's economy, defe
State_highways_in_Michigan Transportation_in_St._Joseph_County,_Michigan