Lesley.] 



154 



[Jan. 15, 



c Surface of water at ordinary stage 709. 

 d In Street in front of Hotel. 



VII. ALLEGHENY SERIES. 



CCG. Pittsburgh City Levels. 



Elevations at different points in tlie City of Pittsburgh, Pa., were furnished 

 by Mr. William Martin, Assistant Engineer. 



Datum : Low water in the Allegheny River at the Suspension Bridge, whicii ac- 

 cording to Mr. Jas. T. Gardner's determination, is 0D9.20' above the Mean Sur- 

 face of the Atlantic Ocean. See page 655, Vol.1, Hayden's Geological Survey Re- 

 port of 1873. 



Elevation of Points in City of Pittsburgh, Pa. 



BENCH MARKS. 



City Datum, 



On Window-sill of Monongahela 

 Incline Plane, Check House.. i 



On Belt-course of Union Depot,! 

 IVIain Entrance I 



On East end Door-sill of Point 

 Breeze Hotel at Intersection 

 of Penn and Fifth Avenue. . . 



On Belt-course of Munshall's Dis- 

 tillery, corner Penn Avenue 

 and Water Street 



On Door-sill of Post Office 



On Eml)ankmcnt of Lower (old) 

 Reservoir on Bedford Avenue 



On Embankment of Upper (old) 

 Reservoir, Bedford Avenue. . 



407.075 

 47.203 



273.814 



28.198 

 51.554 



105.854 



401.674 



Ocean Level. 



1106.275 

 746.403 



973.014 



727.398 

 750.754 



865.044 



1100.874 



