Not my numbers, but seems reasonable (from 2020).
College Lacrosse Odds 2020: Male Female
Number of US High School Lacrosse Players 2019-20 121,011 106,162
Number of College Lacrosse Players (see table below) 16,841 13, 908
% of US HS Lacrosse Players competing at any College Level 13.5% 12.7%
% of US HS Lacrosse Players Competing at NCAA I Schools 2.9% 3.5%
Odds of a US HS Lacrosse Player making any College Roster 7:1 8:1
Odds of a US HS Lacrosse Player making an NCAA I Roster 35:1 28:1 | 
