﻿CONTENTS. 
  

  

  Introduction 
  5 
  

  

  New 
  conditions 
  and 
  probable 
  effect 
  upon 
  movements 
  of 
  fishes 
  6 
  

  

  Preliminary 
  observations 
  10 
  

  

  Description 
  of 
  the 
  Keokuk 
  Dam 
  11 
  

  

  The 
  dam 
  structure 
  11 
  

  

  The 
  power 
  house 
  13 
  

  

  The 
  lock 
  16 
  

  

  The 
  question 
  of 
  a 
  practically 
  effective 
  fish 
  way 
  18 
  

  

  Lake 
  Cooper 
  21 
  

  

  Opportunity 
  and 
  responsibility 
  for 
  investigations 
  22 
  

  

  Appendix: 
  The 
  problem 
  of 
  the 
  migration 
  of 
  river 
  herring 
  25 
  

  

  3 
  

  

  