389 
DECLINE IN ELEVATION OF WATER SURFACE 
Av. slope 
Reach Stage of river pale hg inches per 
. ; mile 
Pekin to Copperas Creek dam Low water 
(above) 1901 16.2 0.14 
Pekin to Copperas Creek dam Flood stage 
(above) Mar. 15, 1903 16.2 1.36 
Pekin to Copperas Creek dam Flood stage 
(above) Mar. 31, 1904 16.2 1.43 
ernment borings of 1902-1905 showed hard bottom at all channel sta- 
tions, the upper layer of sand, gravel, or sand and shells having depths 
‘of from five to twenty-nine feet. In the shore zones within the 7-foot 
line mud bottom was found by us in 1915 at all the collecting stations. 
There is no shore vegetation worth mentioning in the 16 miles. 
Between Pekin and Copperas Creek dam at the 1901 low levels, 
bank to bank widths averaged rather greater than in the Peoria-~Pekin 
section, being usually over 600 feet, and for short distances 700 feet and 
over. The greatest depths at these levels were under 15 feet, and ina 
WiptHS AND Deprus, PEKIN TO Copprras CREEK Dam, 
Low Water, 1901 
Miles 
above Station | Width, ft. | Pane eo 
Grafton z [Sena 
153.0 Pekin at wagon bridge Sak 11.2 
USSG) op ites esd sw copaeatycatesutee.c oe 695 13.0 
1 Ey aed USER Sears As mein, ee se Aare 7.1 
TSM Tasca ee ae sw Seis reeie teat» 750 10.2 
OG Bae maaan caPeis arete. st aysceratettayapallstena ers +6 440 11.0 
PAOLO aa Wrens: in carne tojeteiniarcrevarenawech eeene ater 677 8.6 
ARAB b 95, 38-2 cn pusergornivietateatots eee taye 384 14.1 
OND oy | tar atevay arora hay ayeteere rece Peete aah ore 600 9.0 
MATEO IN i viene, teeie ck Navorcudgate eps cist spa aneteks 610 12.6 
RAGS ellie seks avs Rotuerate ere seas ee te erate 695 7.4 
145.6 CIES HOT ost iaeereionae : 700 8.7 
TAP eng ectndarstaa cae e retiree arate aie 549 14.7 
AAR ball (ets beer oke oie are tic Geeaw eaaecra rer stain 732 7.0 
Ot ot Glee ekatel tel vievecctalteacatetatete wes vahereres sie 622 8.4 
AON G IE We er ereuiotar enslave mtcbaieneseia etateve ae o 586 8.3 
ELS |laecctteevate hte careers oe siots esspocae oe 530 11.6 
H1VS'G) Oise taatorevcusiehevetevctsieiatstare aNeterera wyerrels 550 8.4 
LEE Bt) A) el Aict Se Mack eclcckac odd 586 14.5 
UST: Ul cithopucts Sc! Sisice 6 eine cicaaicS 570 9.3 
TEP oka oles Fete coho See RRA 677 10.4 
BS GIG llmtisaremsennsier ere esenctent wi s/cterarer 549 11.0 
136.8 Dam 
