  We report the results of a study of electroweak parameters from observations
of neutral-current $\nu$N deeply inelastic scattering in the CCFR detector at
the FNAL Tevatron Quadrupole Triplet neutrino beam. An improved extraction of
the weak mixing angle in the on-shell renormalization scheme, incorporating
additional data and with an improved technique for constraining systematic
errors, is presented. Within the Standard Model, this result constrains the W
mass with a precision comparable to that from direct measurements. The result
is also presented in a model-independent form, as constraints on
neutral-current quark-neutrino couplings, to facilitate comparisons with
theories outside the Standard Model. Using this result, limits on new
four-fermion interactions, leptoquarks and neutrino oscillations are presented.
Prospects for a successor experiment, NuTeV (FNAL-E815), are also presented.
