I know you're not asking for this kind of advice, but I'm beginning my sophomore year, so I know how things like this work.
Read your housing contract.
Along with it saying no routers, there is most likely a clause in there that says they have the right to enter your room if they feel that you are violating a policy or that there is an emergency situation. Some schools go as far as to have "fire drills" at unexpected times so they can search your room. (Fire drill = emergency situation) They do it at like 3:00 AM so that you are not thinking about hiding stuff and just want to get out. They will go in your room and if it is in plain sight, they can confiscate it or document it or whatever they do at your school. So if you decide to follow pismobrat's advice, keep in mind that you need to physically hide the router well, along with the security. Otherwise you're opening yourself up to other issues, then they'll take your router AND your beer.
Posted from my personal WiFi in my dorm room since my university provides wifi and allows personal routers
Cisco sells equipment that can detect the exact location of a wireless router in a building. Direction finding these days uses phasing of radio waves, not triangulation, so the days of walking around with a big piece of machine with big antennas trying to get locks on a signal are past. There are even offerings that will pinpoint where an AP is in a building in seconds of the AP being turned on, so someone turning the AP on for 2-3 minutes then off, it will still be noted.
People here are not trying to be self-righteous on this thread. A lot of us know colleges who have not just cut network access, but have actively expelled people for this stuff.
I have seen a lot of colleges getting tired of the cat and mouse game and enabling NAC. This does two things: It means that even if a machine is able to get on the network segment, it won't be able to get a connection unless it is authorized and has software installed and running. The second part is that the software that the NAC controller checks is a policy to deny packet routing/forwarding so people can't use a legit PC as a gateway for other machines.
Best of all worlds? If the college would allow not just wireless, but two segments, one for guests that has no access to anything but the external Internet, and one for the students. However, with the RIAA and MPAA successfully getting regulation passed that forces colleges to actively go against P2P (or else get all public funding cut which means no student loans), one will be seeing more and more restrictions in colleges.