The N.R.C.S. has released their Montana Water Supply Outlook Report for April,  2019.  The full statewide report can be viewed/downloaded here.  The Monthly Forecast Tables can be viewed/downloaded here.  I have attached the forecast table for the Upper Clark Fork drainage below.

March proved to be a near record low precipitation month following the near record high precipitation month of February.  The short summary for Nevada creek is a most likely forecast for 92% of normal (13,000 AF) for the April-July period, and 93% of normal for the April-September period with a total 14,500 AF of flow.  As always, future weather conditions will effect the actual amount & timing of stream flow.