The bench marks included in this book are from mouth of river to Sioux City, Iowa, and from Fort Benton, Mont., to Three Forks, Mont.

The precise bench marks from Sioux City, Iowa, to St. Joseph, Mo., have been platted on the detail maps, scale 1 inch =1,000 feet. At time of running precise line accurate stadia distances were taken to located points of topography, and as line of levels was along the railroad the bench marks have been platted on the detail sheets with about the same degree of accuracy as that of the adjacent topography. Summary of work done by Assistant Engineer O. W. Ferguson:

The remaining work on field notes that was unfinished at end of fiscal year 1893 was completed.

The precise and temporary precise bench marks were platted on detail sheets, scale 1 inch 1,000 feet, from St. Joe to mouth of river.

Several profile sheets were made in office:

One showing the discrepancies between the Missouri River Commission preciselevel line and the bench marks connected with by precise-level party from St. Joe to mouth of river;

A second showing discrepancies between direct and reverse precise level line, from St. Joe to mouth of river;

A third showing discrepancies between U. S. Coast and Geodetic Survey and Missouri River Commission's precise levels from Kansas City to St. Louis; and

A fourth showing limit of error of closure between precise-level lines over same stretch.

The following is a summary of work of Y level survey under my charge:
Party was out forty-two days, including time in going to and from work.

River distance covered..

Line leveled and checked.

River crossings made ....

Precise bench marks connected with

Ordinary bench marks connected with
Stone lines connected with.

Stone lines rerun

Very respectfully, your obedient servant,

Miles.

467

70

37

21

10

O. H. B. TURNER,
Assistant Engineer.

LEVEL

DESCRIPTIONS AND ELEVATIONS OF PRECISE
BENCH MARKS OF SPECIAL
SURVEY FROM BLAIR, NEBR., TO DE WITT, MO.

All elevations are given in both meters and feet, and refer to St. Louis City directrix as zero. The elevation of this above Biloxi sea level is 412.731 feet. A P. B. M. is a precise bench mark that is set to be practically permanent. All P. B. Ms., excepting 327 B, which is a cross on B. M. stone, are (1) top of copper bolts in regulation B. M. stone, or (2) center of copper bolt set horizontally, or (3) marks on bridge piers.

The value of the meter used is 3.2808693 feet.

Descriptions and elevations of precise level bench marks, etc.—Continued.

P. B. M. 360 C... Is on west pier of railroad bridge across Missouri River, near Blair, Nebr. Is cut on top of coping of north end of pier with the letters U. S.

Is on west pier of railroad bridge across Missouri River,
near Blair, Nebr. The bench is in south side of pier, in
third course of masonry, below lower coping stone, is
upper surface of a projection 0.5 feet below top of stone
2.3 feet northwest from south corner of pier.
Is about 1 miles southwest of Pacific Junction, Mills
County, Iowa, on land owned by Charles Kroon, 32 feet
east, 51 feet south of the northwest corner of the north-
east quarter of the northeast quarter of section 32, T. 72
and N., R. 43 W., being copper bolt in B. M. stone.

Is about 1 miles east of railroad bridge across Missouri
River at Plattsmouth, Nebr.; is on south side of east
and west road, 128 feet east and 40 feet south of north-
west corner section 31, T. 72 N., R. 43 W., in dooryard
of Miss Lizzie Smith, being copper bolt in B. M. stone.

On top of stone foundation of north end of first iron bent
west of the west stone pier of the railroad bridge across
Missouri River at Plattsmouth, Nebr. The B. M. is the
highest part of the stone between the grooves at north-
east corner of cross (+).

Is at railroad bridge across Missouri River at Plattsmouth,
Nebr.; is 10 feet south, and on line with first trestle bent
west of west pier, being copper bolt in B. M. stone.

Is 3,884 feet northward from depot at Nebraska City
Junction, Fremont County, Iowa, and 45 feet east of
the Kansas City, St. Joseph and Council Bluffs Ry.
track on a sand knoll, being copper bolt in B. M. stone.

Is about 15 miles west of Nebraska City Junction, Iowa,
on south side of wagon road running west from Ne-
braska City Junction to Burlington and Missouri River
R. R. bridge across Missouri River at Nebraska City,
Nebr.; is 1,150 feet east of a house on north side of road
occupied by John Duncan, 3,130 feet west of where wagon
road crosses Burlington and Missouri track to Payne's
pasture, and 7 feet south of fence, being copper bolt in
B. M. stone.

Is in west abutment of Burlington and Missouri River R.
R. bridge across the Missouri River at Nebraska City,
Nebr.; is highest part in center of circle cut in third
stone from west in top course of masonry, and is marked
with letters B. M. on south.

Is on west abutment of Burlington and Missouri River R.
R. bridge across Missouri River at Nebraska City, Nebr.;
is a bench cut in south side of abutment, about 2 feet
above ground, near southeast corner.

Is at Phelps, Atchison County, Mo., in the northeast
corner of the Methodist churchyard and 38 feet from
the northeast corner of the church, being copper bolt
in B. M. stone.

Is about 1 mile west from Phelps, Mo., on south side of
east and west road, 780 feet west from northeast corner
of SE. sec. 34, T. 65 N., R. 42 W., in dooryard of B.
A. DeBuhr, being copper bolt in B. M. stone.

Is at Brownville, Nebr., at northwest corner of Main
street and levee, and 122 feet northwest from depot,
being copper bolt in B. M. stone.

Is 627 feet southward from the depot at Napier, Holt
County, Mo., 287 feet south ward from the head block of
the Burlington and Missouri River and the Kansas
City, St. Joseph and Council Bluffs Ry. junction, and
43 feet east of the Kansas City, St. Joseph and Council
Bluffs Ry, track, being copper bolt in B. M. stone.

Descriptions and elevations of precise level bench marks, etc.—Continued.

Description.

Is about 650 feet east of the depot at Fortescue, Mo., 59
feet north of center of main track of Burlington and
Missouri River R. R., and 39 feet west from west end of
section house, being copper bolt in B. M. stone.

Is about 10,830 feet west from Fortescue, Mo., 66 feet north
of Burlington and Missouri River R. R. track, 650 feet
west of south end of Tarkio Lake, and 23 feet east of a
16-inch blazed cottonwood on land belonging to Collins,
being copper bolt in B. M. stone.

Is 7,600 feet east from east pier of Burlington and Missouri
River R. R. bridge across the Missouri River at Rulo,
Nebr., 400 feet north of Burlington and Missouri River
track center, 20 feet west of north and south road,
which crosses the line of Burlington and Missouri River
R. R. under the first bridge east from river, 82 feet north-
east from small log house occupied by K. Burge and on
land owned by Ben Cunningham, in southeast corner
of cultivated field and 2 feet from corner post of 'ence,
being copper bolt in B. M. stone.

Is in west pier of Burlington and Missouri River R. R.
bridge across Missouri River at Rulo, Nebr. Is center of
hole in horizontal bolt leaded into west side of granite
pier, in second course of masonry above ground, and in
fourth block from north end, and in third block from
south end of pier. Is 0.3 foot below top of block and
1.8 feet from south end, and 1.5 feet from north end. Is
marked U. S.

B. M.

Is in west face of a granite block in the west side of the
west pier of Burlington and Missouri River R. R.
bridge at Rulo, Nebr. The block is in second course of
masonry from ground, and is the first straight block from
the south end of pier (the block south being rounded),
The bench is a projection flattened on upper side, and
is 1.7 feet from north end of block and 0.4 foot below
top of block.

P. B. M. 304 E.. Is at Rulo, Nebr., in dooryard of John Stull, at west side 135.8055
of Commercial street, and 170 feet south from south
line of Stutzen street. Is copper bolt in B. M. stone.

Top of cap. P. B. M. 304 E 7.

P. B. M. 228= 72

Is on right bank about 3 miles below Hannibal and St.
Joseph R. R. bridge across Missouri River at Kansas City,
Mo., five-eighths of a mile southeast of Crescent elevator,
about 2,295 feet north of tile factory, at northeast corner
of intersection of two county roads, 120 feet S. 65° W. of
Lizzie Wright's house; being copper bolt in B. M. stone.

Is on west end of north pier of Chicago, Milwaukee and
St. Paul R. R. bridge across Missouri River near Kansas
City, Mo.
Is center of square cut in cap stone, 1.1 feet
west of west iron girder of approach, and 1.5 feet south
from north edge of pier. The letters B. M. are cut in
the stone south of square.

Is on left bank 970 feet above Chicago, Milwaukee and
St. Paul R. R. bridge across the Missouri River near
Kansas City, Mo., and 25 feet toward river from Wabash
track. Is copper bolt in B. M. stone.

Is opposite De Witt, Mo., on line running east and west
through center of section 22, T. 53, R. 21 W., 60 feet west
of quarter post between sections 22 and 23, about 820
feet west of S. W. Wood's house at south road fence;
being copper bolt in B. M. stone.

Is on right bank, opposite De Witt, Mo., and about one-half
of a mile from Missouri River. Is on east side of north
and south road between sections 15 and 16, and 470 feet
north from southwest corner of section 15; being copper
bolt in B. M. stone.

137.0402
97.8868

445.560

449.611

321. 154

Descriptions and elevations of precise level bench marks, etc.—Continued.

TABULATION OF PRECISE LEVEL RESULTS, BLAIR, NEBR., TO DE WITT, MO., 1893.

In the table of results column 1 gives the bench mark, T. B. M., signifying temporary bench mark, and P. B. M, signifying precise level bench mark.

Column 2 gives the bench mark from which that in column 1 was determined. Column 3 gives the length of stretch in meters.

Column 4 gives the distance in kilometers from initial bench mark.

Column 5 gives the direction in which the line was leveled. Dir. is for the direct line. Rev. is for the reverse line.

Column 6 gives successive differences of elevation in millimeters between bench marks and the means of such determinations.

Column 7 gives the residuals found by substracting each determination from the

mean.

Column 8 gives the discrepancy between the direct line and the mean, and is the algebraic sum of the residuals.

Column 9 gives the discrepancy between the reverse line and the mean, and is the algebraic sum of the residuals.

Column 10 gives the probable error, r, of the mean in column 5.

Column 11 gives the probable error, R, of the mean elevation of each bench mark as computed from the beginning of the section.

Column 12 gives the total rod correction as computed from initial bench mark (not used).

Column 13 gives the elevation in meters of all bench marks referred to St. Louis directrix.

Column 14 gives the elevation in feet of all bench marks referred to St. Louis directrix.

Column 15 gives the elevation in feet of all old bench marks connected with referred to St. Louis directrix.

Column 16 gives the discrepancy in feet of old bench marks.

Column 17 gives the initial of observers; T. is for Assistant Engineer O. H. B.

Turner.

Bench marks marked with an asterisk (*) are not in the main l.ne.
The value of the meter used is 3.2808693 feet.