﻿WATER-POWEK 
  DEVELOPMENT 
  IN 
  THE 
  MISSISSIPPI. 
  11 
  

  

  information 
  requested. 
  Tlie 
  lock 
  was 
  also 
  operated 
  for 
  purpose 
  of 
  

   demonstration 
  ."■ 
  

  

  DESCRIPTION 
  OF 
  THE 
  KEOKUK 
  DAM. 
  

  

  The 
  figures 
  and 
  essential 
  data 
  regarding 
  the 
  construction 
  plan 
  are 
  

   largely 
  gleaned 
  from 
  a 
  lucid 
  description 
  of 
  the 
  dam 
  comprised 
  in 
  a 
  

   booklet 
  entitled 
  "Electric 
  Power 
  from 
  the 
  Mississippi 
  River" 
  and 
  

   issued 
  by 
  the 
  Mississippi 
  River 
  Power 
  Co., 
  at 
  Keokuk 
  in 
  1912 
  

   and 
  1913. 
  

  

  The 
  plant 
  consists 
  of 
  the 
  following 
  principal 
  elements 
  (see 
  pi. 
  ii) 
  : 
  

   A 
  dam 
  proper, 
  53 
  feet 
  high 
  over 
  all 
  and 
  four-fifths 
  of 
  a 
  mile 
  

   long, 
  extending 
  across 
  the 
  ^Mississippi 
  from 
  the 
  Illinois 
  shore 
  at 
  Ham- 
  

   ilton 
  and 
  connecting 
  at 
  its 
  western 
  end 
  with 
  the 
  power 
  house, 
  which 
  

   is 
  built 
  in 
  the 
  river 
  several 
  hundred 
  feet 
  from 
  the 
  Iowa 
  shore; 
  the 
  

   power 
  house 
  has 
  its 
  length 
  almost 
  parallel 
  with 
  the 
  river 
  shore, 
  

   extending 
  in 
  a 
  downstream 
  direction 
  from 
  the 
  terminus 
  of 
  the 
  dam 
  

   proper, 
  and 
  is 
  practically 
  one- 
  third 
  of 
  a 
  mile 
  in 
  length, 
  over 
  132 
  feet 
  

   wide, 
  and 
  with 
  the 
  great 
  height 
  of 
  177 
  feet 
  6 
  inches 
  or 
  from 
  25 
  feet 
  

   below 
  the 
  surface 
  of 
  the 
  limestone 
  river 
  bottom 
  to 
  jiearly 
  110 
  feet 
  

   above 
  the 
  surface 
  of 
  the 
  lake 
  at 
  high 
  water; 
  the 
  lower 
  end 
  of 
  the 
  

   power 
  house 
  (one-third 
  of 
  a 
  mile 
  below 
  the 
  dam) 
  is 
  joined 
  to 
  the 
  Iowa 
  

   shore 
  by 
  a 
  series 
  of 
  constructions, 
  including 
  a 
  section 
  of 
  dam 
  about 
  

   100 
  feet 
  long, 
  which 
  provides 
  a 
  narrow 
  chute 
  and 
  houses 
  the 
  machin- 
  

   ery 
  for 
  operation 
  of 
  the 
  lock 
  and 
  dry 
  dock, 
  the 
  lock 
  110 
  feet 
  wide 
  and 
  

   400 
  feet 
  long, 
  inside 
  dimensions 
  (618 
  feet 
  over 
  all), 
  and 
  the 
  dry 
  dock, 
  

   150 
  by 
  463 
  feet. 
  

  

  It 
  thus 
  appears 
  that 
  a 
  bay 
  or 
  harbor 
  of 
  considerable 
  size 
  is 
  formed 
  

   between 
  the 
  power 
  house 
  and 
  the 
  Iowa 
  shore, 
  limited 
  on 
  the 
  lower 
  

   side 
  by 
  the 
  lock 
  and 
  dry 
  dock. 
  This 
  is 
  called 
  the 
  fore 
  bay 
  and 
  is 
  

   protected 
  on 
  its 
  upper 
  side 
  by 
  a 
  curved 
  ice 
  fender 
  composed 
  of 
  con- 
  

   crete 
  arches 
  in 
  a 
  series 
  2,325 
  feet 
  long 
  and 
  300 
  feet 
  of 
  floating 
  boom 
  

   which 
  may 
  be 
  opened 
  back 
  during 
  the 
  navigation 
  season. 
  It 
  extends 
  

   from 
  the 
  upper 
  eastern 
  or 
  offshore 
  corner 
  of 
  the 
  power 
  house 
  (that 
  

   is, 
  from 
  the 
  western 
  terminus 
  of 
  the 
  dam) 
  to 
  the 
  Iowa 
  shore, 
  the 
  

   direction 
  being 
  somewhat 
  curved, 
  and 
  the 
  total 
  length 
  about 
  half 
  

   a 
  mile. 
  

  

  The 
  parts 
  which 
  are 
  of 
  immediate 
  interest 
  to 
  us 
  are 
  the 
  dam, 
  the 
  

   power 
  house, 
  and 
  the 
  lock. 
  

  

  THE 
  DAM 
  STRUCTURE. 
  

  

  The 
  dam 
  proper 
  is 
  merely 
  for 
  the 
  repression 
  of 
  water 
  and 
  the 
  

   provision 
  of 
  spillways. 
  It 
  is 
  4,278 
  feet 
  long, 
  or, 
  with 
  its 
  abutments, 
  

   practically 
  1 
  mile. 
  (PI. 
  ii.) 
  

  

  ol 
  desire 
  to 
  acknowledge 
  the 
  courtesy 
  of 
  Maj. 
  M. 
  Meigs, 
  United 
  States 
  engineer, 
  who 
  extended 
  me 
  the 
  

   privilege 
  of 
  examination 
  of 
  the 
  lock 
  and 
  facilitated 
  my 
  investigation 
  in 
  other 
  ways. 
  

  

  22889°— 
  14 
  35 
  

  

  