calculate distance between points along stream network?

[SierraLove_Stowell]

Hi,

I have fourteen points on streams and I need to calculate a matrix of pairwise distances between all fourteen points along the stream network (91 comparisons).  Getting the Euclidean distance between the points is relatively straightforward but how do I get the distance along the streams?  Help!

Sierra

[MarkBoucher]

Could you use the cost distance tool in Spatial Analyst? 

Use the stream to set a low cost in a raster along the stream and high cost elsewhere. Then do a cost distance calculation along the stream with a source grid at one end. Then then pick the cost off the resulting grid where the points are and take the difference in cost distance between points. (?)