 Within the city , roads that run from north to south are traditionally called " streets " and roads that run from east to west are traditionally called " avenues " . Streets are numbered in blocks west of the Red River . Avenues are numbered in blocks north or south of DeMers Avenue – the city 's historic dividing route adjacent to the rail yards . The city maintains a bus system called Cities Area Transit , also known by the acronym CAT . The system has operated since 1926 when it was introduced to replace an earlier trolley system . There are twelve bus routes including night service and service in the community of East Grand Forks . 
