Add a js variable to url path inside a function using Ember

I have a button controller that gets a 'countyId' from a ddl inside html once button is clicked. I get the countyId and need to add it to my URL just like the {{#link-to this}} does it inside App.Router.map...

My controller:

App.CresRoute = Ember.Route.extend({
model: function() {
    return county;
},
actions: {
    redirect: function(countyId){
        alert(countyId); //For debug, knowing I have the ID
        //CODE TO ADD countyId TO URL...
    }
}
});

How can I do this using Ember framework?

Thanks!