﻿110 
  

  

  REPORT 
  UNITED 
  STATES 
  GEOLOGICAL 
  SURVEY. 
  

  

  the 
  drainage 
  flowing 
  eastward 
  between 
  Costilla 
  Peak 
  and 
  station 
  113 
  

   belongs 
  to 
  that 
  stream. 
  Between 
  station 
  113 
  and 
  Trinchera 
  Peak 
  the 
  

   waters 
  of 
  Eio 
  Pnrgatorio 
  head. 
  Three 
  main 
  branches 
  join 
  near 
  station 
  

   128, 
  and 
  form 
  the 
  river. 
  The 
  South 
  Fork 
  heads 
  between 
  station 
  113 
  and 
  

   Culebra 
  Peak, 
  while 
  the 
  next 
  six 
  miles 
  farther 
  north 
  contain 
  the 
  origin 
  

   of 
  the 
  Middle 
  Fork 
  drainage, 
  and 
  the 
  seven 
  miles 
  intervening 
  between 
  

   that 
  and 
  Trinchera 
  Peak 
  send 
  their 
  waters 
  into 
  the 
  North 
  Fork.* 
  

  

  Immediately 
  north 
  of 
  Trinchera 
  Peak 
  heads 
  Arapaho 
  Creek. 
  Its 
  

   general 
  course 
  is 
  a 
  northeasterly 
  one. 
  From 
  the 
  mountains 
  between 
  

   stations 
  123 
  and 
  120 
  it 
  receives 
  many 
  small 
  tributaries; 
  larger 
  ones 
  flow, 
  

   northward 
  into 
  it 
  from 
  the 
  Spanish 
  Peaks. 
  Flowing 
  from 
  the 
  west 
  into 
  

   it 
  are 
  the 
  streams 
  heading 
  near 
  and 
  southwest 
  of 
  station 
  5. 
  On 
  the 
  

   northeast 
  side 
  of 
  Bast 
  Spanish 
  Peak 
  heads 
  Eio 
  Santa 
  Clara. 
  It 
  flows 
  

   east 
  of 
  north 
  and 
  joins 
  the 
  Arapaho. 
  After 
  the 
  junction 
  the 
  large 
  

   river 
  thus 
  formed 
  is 
  called 
  Eio 
  Cucharas, 
  which, 
  flowing 
  east 
  of 
  north, 
  

   continues 
  the 
  course 
  followed 
  by 
  Santa 
  Clara, 
  and 
  joins 
  the 
  Huerfano. 
  

   Eio 
  Apishpa 
  rises 
  on 
  the 
  southern 
  slope 
  of 
  the 
  Spanish 
  Peaks, 
  and 
  flows 
  

   first 
  east, 
  then 
  northeast. 
  With 
  this 
  the 
  main 
  streams 
  of 
  the 
  region 
  

   discussed 
  in 
  chapter 
  I 
  are 
  exhausted. 
  Some 
  of 
  them 
  are 
  of 
  considera- 
  

   ble 
  length, 
  and 
  all 
  of 
  them 
  certainly 
  of 
  great 
  importance 
  to 
  the 
  agricul- 
  

   tural 
  pursuits 
  carried 
  on 
  in 
  their 
  valleys. 
  As 
  a 
  rule 
  the 
  soil 
  of 
  these 
  

   valleys 
  is 
  good, 
  and 
  in 
  case 
  the 
  farmer 
  is 
  enabled 
  to 
  procure 
  an 
  ade- 
  

   quate 
  supply 
  of 
  water 
  for 
  his 
  purposes 
  of 
  irrigation, 
  nothing, 
  save 
  such 
  

   casualties 
  to 
  which 
  all 
  agriculturists 
  are 
  exposed, 
  stands 
  in 
  the 
  way 
  of 
  

   his 
  success. 
  Measurement* 
  approximating 
  the 
  lengths 
  of 
  these 
  impor- 
  

   tant 
  streams 
  are 
  herewith 
  appended, 
  as 
  they 
  furnish 
  a 
  criterion 
  for 
  the 
  

   question 
  as 
  to 
  the 
  relative 
  quantities 
  of 
  water 
  carried 
  by 
  each. 
  The 
  

   largest 
  tributaries 
  are 
  also 
  given 
  for 
  each 
  one, 
  and 
  the 
  sum 
  firstly 
  of 
  

   these, 
  secondly 
  of 
  the 
  entire 
  system 
  of 
  large 
  water-courses, 
  added 
  : 
  

  

  Name 
  of 
  river. 
  

  

  Length 
  of 
  river 
  

   in 
  miles. 
  

  

  Huerfano 
  

  

  Panpre 
  de 
  Cristo 
  

  

  Eio 
  Culebra 
  

  

  iHo 
  CoMill.'\ 
  

  

  I!io 
  Sauia 
  Clara. 
  

   Arapaho 
  Creek. 
  

   Ctwhijxus 
  

  

  74 
  

   43 
  

   37 
  

   4fi 
  

   34 
  

   41 
  

  

  Lorgth 
  of 
  main 
  

   tributaries 
  in 
  

   railes, 
  added. 
  

  

  63 
  

  

  Total 
  lenjrth 
  of 
  

   main 
  drainage 
  

   in 
  miles. 
  

  

  156 
  

   90 
  

   99 
  

   72 
  

   34 
  

  

  104 
  

  

  LENGTH 
  OF 
  SOME 
  TRIBUTARIES 
  IN 
  MILES. 
  

  

  Sangre 
  de 
  Criato 
  

  

  Culebra 
  

  

  CoHtilla 
  

  

  Arapaho 
  

  

  HiKrfaDO 
  

  

  Name 
  of 
  tributary. 
  

  

  ITte 
  Creek 
  

  

  Trinchera 
  

  

  Kio 
  Spco 
  

  

  North 
  Fork 
  

  

  Spanish 
  Creok.. 
  

   Muddy 
  

  

  J/fe?. 
  

  

  METAMORPniCS, 
  

  

  The 
  area 
  above 
  described 
  contains 
  quite 
  a 
  considerable 
  amount 
  of 
  

   metamori)hic 
  outcrops. 
  There 
  seems 
  to 
  be 
  no 
  doubt, 
  from 
  the 
  numer- 
  

   ous 
  indications 
  found, 
  that 
  metamorphosed 
  rocks 
  form 
  the 
  main 
  bulk 
  

  

  * 
  The 
  region 
  of 
  the 
  Purgatorio 
  is 
  treated 
  cf 
  in 
  chapter 
  5. 
  

  

  