interpolating values from a set of points but only up to a certain distance

Discussion created by shazeb on Mar 18, 2011
Latest reply on Mar 21, 2011 by shazeb
Let's say I have a set of points representing bridges.  I want to create a kind of "heat" map that would highlight areas within my study area that has many bridges in good or bad condition.  I have a rating attribute for each bridge point. 

I've tried the spline interpolation method (in ArcGIS spatial analyst) which seems to work okay but it interpolates values for the entire area.  I only want raster values for areas that within a certain distance of a bridge point (say one mile for example).  How would I go about doing this?