﻿W 
  I 
  

  

  ooustruction 
  will 
  in 
  rlie 
  case 
  of 
  low 
  diiiiis 
  practically 
  

   place 
  the 
  Diontk 
  of 
  tlie 
  tishway 
  in 
  tlie 
  line 
  of 
  the 
  face 
  of 
  

   the 
  dam. 
  

  

  In 
  the 
  case 
  of 
  high 
  dams 
  it 
  will 
  probably 
  be 
  better 
  to 
  

   build 
  the 
  tishway 
  with 
  a 
  return 
  or 
  elbow, 
  so 
  as 
  to 
  make 
  

   the 
  discharge 
  at 
  the 
  face 
  of 
  the 
  dam. 
  

  

  In 
  the 
  case 
  of 
  the 
  Lanrel 
  Mills 
  dam, 
  there 
  being 
  no 
  

   surplus 
  of 
  water 
  to 
  deal 
  with 
  ordinarily, 
  the 
  tishway 
  

   may 
  be 
  made 
  much 
  narrower 
  and 
  the 
  w^ater 
  discharge 
  

   ])roi^ortionally 
  reduced 
  ; 
  a 
  width 
  of 
  two 
  or 
  fonr 
  feet* 
  for 
  

   tlie 
  water 
  way 
  would 
  in 
  this 
  case 
  l)e 
  enough. 
  Such 
  a 
  

   lishway 
  would 
  provide 
  access 
  to 
  the 
  ui)per 
  waters 
  of 
  the 
  

   Patiixent 
  for 
  the 
  salmon, 
  the 
  herrings 
  and 
  all 
  the 
  ana- 
  

   dronious 
  or 
  river 
  species, 
  except 
  the 
  shad. 
  I 
  doubt 
  if 
  

   the 
  volume 
  of 
  water 
  would 
  l)e 
  sufficient 
  to 
  induce 
  the 
  

   ascent 
  of 
  the 
  last 
  named 
  sj^ecies 
  in 
  considera])le 
  numbers. 
  

  

  I 
  also 
  examined 
  the 
  dam 
  at 
  the 
  Eelay 
  House, 
  on 
  the 
  

   Patapsco. 
  This 
  is 
  a 
  timber 
  dam 
  about 
  7 
  feet 
  high, 
  and 
  

   is 
  the 
  first 
  olistruction 
  on 
  the 
  river 
  above 
  tide- 
  water. 
  

   ITpon 
  the 
  dam 
  there 
  is 
  now 
  a 
  crude 
  fislnvay 
  of 
  the 
  old 
  

   style, 
  built 
  1)y 
  the 
  owner, 
  I 
  presume, 
  in 
  conformity 
  to 
  

   the 
  requirements 
  of 
  the 
  State 
  law. 
  

  

  It 
  is 
  not 
  probable 
  that 
  the 
  State 
  will 
  enter 
  up(m 
  the 
  

   enforcement 
  of 
  a 
  law 
  making 
  the 
  erection 
  of 
  tishways 
  

   obligatory, 
  until 
  their 
  efficiency 
  has 
  been 
  tested 
  and 
  

   ax>proved 
  by 
  your 
  State 
  Commission. 
  

  

  The 
  dam 
  above 
  mentioned 
  furnishes 
  an 
  admirable 
  

   location 
  for 
  making 
  the 
  experimental 
  tests 
  required. 
  

  

  I 
  have 
  therefore 
  carefulh'- 
  examined 
  the 
  locality, 
  and 
  

   submit 
  to 
  you 
  the 
  general 
  plan 
  of 
  a 
  tishway, 
  such 
  as 
  I 
  

   think 
  M 
  ell 
  adapted 
  to 
  meet 
  the 
  particular 
  requirements 
  

   of 
  the 
  case, 
  and 
  if 
  approved, 
  will 
  serve 
  as 
  a 
  model 
  for 
  

   subsequent 
  c( 
  instructions. 
  

  

  The 
  cost 
  of 
  this 
  construction 
  will 
  be 
  from 
  five 
  to 
  eight 
  

   hundred 
  dollars, 
  varying 
  with 
  the 
  cost 
  of 
  securing 
  the 
  

   foundations 
  on 
  which 
  to 
  build 
  the 
  superstructure. 
  

   Very 
  respectfully 
  vours, 
  

  

  *M. 
  McDonald. 
  

  

  