DESCRIPTIONS AND ELEVATIONS OF PRECISE BENCH MARKS BETWEEN ST. PAUL, MINNESOTA, AND SAVANNA, ILLINOIS.

[NOTE-Elevations are given in meters and feet above the Cairo datum plane. A. P. B. M. is a precise bench mark which is set with special care so as to be practically permauent. A. T. B. M. is a temporary bench mark whose elevation is as well determined as the P. B. M., but which is not regarded as specially permanent. To reduce to mean Gulf level at Biloxi, Miss., subtract 21.26 feet (preliminary value) from the elevations here given. These bench marks were established in 1891. One meter =3.2808693 feet.]

U. S. T. B. M. 1 is in St. Paul, on the southeast corner of Washington and Eagle streets, on curbing, directly over the center of inlet grating, being the highest part of square cut in the granite.

Elevation, 224.5248 meters. 736.637 feet.

U. S. P. B. M. 65 is in St. Paul, on the southeast corner of Washington and Eagle streets, 9.2 feet from the south side of Washington, 1.0 foot above the old city storehouse which stands on the east side of Eagle, in center of a regulation tile 18 inches square and 4 inches thick, set 23 feet below the surface of ground, being the top of a -inch copper bolt leaded vertically.

Elevation, 223.8449 meters. 734.406 feet.

U. S. P. B. M. 66 is top of cap over iron pipe 4 inches in diameter and 4 feet long, set directly over and concentric with U. S. P. B. M. 65, and standing 16 inches above ground.

Elevation, 225.0646 meters. 738.408 feet.

U. S. P. B. M. 67 is in St. Paul, on the left bank of the Mississippi River, on the shore pier of Wabasha Street Bridge, on the northwest corner of the upper pier, 6 inches from bridge seat stone, being the top of copper bolt leaded vertically, marked O

"U.S."

P. B. M.

Elevation, 222.0624 meters. 728.558 feet.

U. S. P. B. M. 68 is in St. Paul, on the left bank of the Mississippi River, on lower wing wall of Kansas City and St. Paul Railway Bridge, 4.76 feet above the lower end of bridge seat course and 2.75 feet back from its front edge, being top of copper bolt

Old U. S. B. M. "A" is in St. Paul, on the left bank of the Mississippi River, on the lower bench of retaining wall of embankment of the Chicago, St. Paul and Kansas City Railway Bridge, being the highest point of ring cut in top of stone marked "O".

Elevation, 221.6380 meters. 727.165 feet.

U. S. P. B. M. 70 is in St. Paul, about 100 feet west of Jackson street, on the north side of railroad tracks opposite the Diamond Joe Freight Depot, at the east end of retaining wall and 4 inches back of its face, being the top of copper bolt leaded in regulation tile.

Elevation, 220.8730 meters. 724.655 feet.

U. S. P. B. M. 71 is top of cap over iron pipe set over P. B. M. 70, about 14 inches above ground.

Elevation, 222.0925 meters. 728.656 feet.

U.S. P. B. M. 72 is on the St. Paul City court-house, Fifth and Wabasha streets, on the west end of doorsill of the south entrance to basement, 6 inches from either wall, being the top of a copper bolt leaded vertically, marked P. B. M.

Elevation, 243.9006 meters. 800.206 feet.

"U.S."

Old U. S. B. M. 24 of survey of 1889 is in St. Paul, on north abutment, east side, lowest step of wing wall of Chicago, St. Paul and Kansas City Bridge, about 2 inches from its face; also, about 2 inches from the second step, said to have been marked by a scratch "", now being highest point in square cut in stone.

Elevation, 217.9797 meters. 715.163 feet.

Gauge of the Signal Service is in St. Paul, at the upper end of the St. Louis, St. Paul and Minneapolis Packet Company's dock.

Elevation of gauge, zero 214.7583 meters. 704.594 feet.

Gauge, U. S. Engineers is in St. Paul, about 50 feet above the lower end of the St. Louis, St. Paul and Minneapolis Packet Company's docks.

Elevation of gauge zero, 214.9138 meters. 705.104 feet.

U. S. P. B. M. 73 is in the east end of St. Paul, on the southeast side of the wall which is on the southeast side of Schmidt & Constanz's brewery, about 120 feet north from railroad tracks and 30 feet from the sand-rock bluff, being a copper bolt in tile set 3 feet below ground.

Elevation, 219.4865 meters. 720.107 feet.