lAst of Altitudes i/n Illinois. 113 



Amity J. C. Turner 445 



Berryville " 440 



Bovvyer " 450 



Gallagher " 415 



Passport " 480 



String-town " 490 



Wakefield ''• 495 



Wynoose " 465 



ROCK ISLAND COUxNTY. 



Bench-marks. 



U. S. P. B. M. 40. 



Lower end of Arsenal Island, East side 

 of stone tower of U. S. Arsenal, N. E. 



corner, 4 ft. from ground 57G.1 



U. S. P. B. M. 41. 



Kock Island. N. E. corner of foundation 



of Atlantic Brewery 579.72 



U. S. P. B. xM. 42. ^ 



South abutment of wagon biidge from 



Mohne to head of Rock Island 567.61 



U. S. P. B. M. 43. 



Watertown. Near N. W. corner of base- 

 ment of H. Smith's dwelling 574,12 



U. S. P. B. M. 45. 



Hampton. N. W. corner of foundation 



of Baker & Haward's brick store 568.96 



U. S. P. B. M. 46. 



Rapid City. N. W. corner of foundation 



of Gilchrist's brick store 575.5 



U. S. P. B. M. 47. 



On west end of north abutment of 

 C, M. & St. P. R. R. bridge over Barber's 



Creek 578.86 



U. S. P. B. M. 48. 



Port liyron. On S. W. corner of founda- 

 tion of N. Dorrence's brick store 580.05 



U. S. P. B. M. 49. 



Port Byron. In iron doorstep of A. H, 

 Wandt's brick store 586.4 



Low water. Miss. River at Rock Island 541.83 



Bridge between Rock Island and Davenport 589 



