RewriteEngine on

RewriteCond %{REQUEST_URI}  /campus.php?college=([^s&]+) [NC]
RewriteRule ^ /campus/%1? [R=301,L]

RewriteCond %{REQUEST_FILENAME} !-d # not a dir
RewriteCond %{REQUEST_FILENAME} !-f # not a file
RewriteRule ^campus/(.*)$ /campus.php?college=$1 [NC,L]