waa-skaman92135-1_proposed-alignment.pdf
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- 69056725B000013
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These are Horizontal & Vertical Alignment Reports for the Federal Highway Administration's Western Federal Lands Highway Division Project, specifically the WA FLAP Skaman 92135(1) Wind River Road Slide Reconstruction project. The reports, created on September 3, 2025, provide detailed technical specifications for road alignment, including horizontal and vertical design parameters.
The horizontal alignment report details the road's geometric design, featuring multiple linear and circular elements with varying tangent lengths, radii, and directional changes. The vertical alignment report describes the road's elevation profile, showing a series of linear and symmetrical parabolic segments with changing grades ranging from 3.103% to 6.300%. The total project length appears to be approximately 5,885 feet (from station 10+00.000 to 27+08.000), with elevation changes from 304.256 feet to 394.018 feet, indicating significant terrain variations that require careful road reconstruction engineering.
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Horizontal & Vertical Alignment Reports for
MAIN 01
for
FEDERAL HIGHWAY ADINISTRATION
WESTERN FEDERAL LANDS
HIGHWAY DIVISION PROJECT
WA FLAP SKAMAN 92135(1)
WIND RIVER ROAD
SLIDE RECONSTRUCTION
Horizontal Alignment Review Report
Report Created: Wednesday, September 3, 2025 Time: 8:18:31 AM
Project: Design SurvFt
Description:
File Name: c:\pw-work\d0510526\waa-skaman92135-1_ali.dgn
Last Revised: 9/3/2025 08:11:53
Note: All units in this report are in feet unless specified otherwise.
Alignment Name: ALI_MAIN_01
Alignment Description:
Alignment Style: Alignment\Baseline
Station Northing Easting
Element: Linear
START ( START ) 6+09.388 142023.998 1300795.859
PC ( PC ) 6+84.283 142094.845 1300820.149
Tangential Direction: N18.925°E
Tangential Length: 74.895
Element: Circular
PC ( PC ) 6+84.283 142094.845 1300820.149
HPI ( HPI ) 7+49.826 142156.845 1300841.406
CC ( CC ) 142062.412 1300914.744
PT ( PT ) 8+00.320 142162.091 1300906.739
Radius: 100.000
Delta: 66.484° Right
Degree of Curvature (Arc): 57.296°
Length: 116.037
Tangent: 65.543
Chord: 109.636
Middle Ordinate: 16.364
External: 19.566
Back Tangent Direction: N18.925°E
Back Radial Direction: S71.075°E
Chord Direction: N52.167°E
Ahead Radial Direction: S4.591°E
Ahead Tangent Direction: N85.409°E
Element: Linear
PT ( PT ) 8+00.320 142162.091 1300906.739
PC ( PC ) 8+25.131 142164.077 1300931.471
Tangential Direction: N85.409°E
Tangential Length: 24.811
Element: Circular
PC ( PC ) 8+25.131 142164.077 1300931.471
HPI ( HPI ) 9+13.448 142171.146 1301019.504
CC ( CC ) 142463.115 1300907.458
PT ( PT ) 9+96.911 142224.786 1301089.665
Radius: 300.000
Delta: 32.808° Left
Degree of Curvature (Arc): 19.099°
Length: 171.780
Tangent: 88.316
Chord: 169.443
Middle Ordinate: 12.211
External: 12.730
Back Tangent Direction: N85.409°E
Back Radial Direction: S4.591°E
Chord Direction: N69.005°E
Ahead Radial Direction: S37.399°E
Ahead Tangent Direction: N52.601°E
Element: Linear
PT ( PT ) 9+96.911 142224.786 1301089.665
PC ( PC ) 12+74.800 142393.563 1301310.428
Tangential Direction: N52.601°E
Tangential Length: 277.889
Element: Circular
PC ( PC ) 12+74.800 142393.563 1301310.428
HPI ( HPI ) 14+11.963 142476.870 1301419.394
CC ( CC ) 143187.993 1300703.071
PT ( PT ) 15+47.425 142586.441 1301501.905
Radius: 1000.000
Delta: 15.620° Left
Degree of Curvature (Arc): 5.730°
Length: 272.625
Tangent: 137.163
Chord: 271.782
Middle Ordinate: 9.276
External: 9.363
Back Tangent Direction: N52.601°E
Back Radial Direction: S37.399°E
Chord Direction: N44.791°E
Ahead Radial Direction: S53.019°E
Ahead Tangent Direction: N36.981°E
Element: Linear
PT ( PT ) 15+47.425 142586.441 1301501.905
PC ( PC ) 16+87.824 142698.596 1301586.362
Tangential Direction: N36.981°E
Tangential Length: 140.399
Element: Circular
PC ( PC ) 16+87.824 142698.596 1301586.362
HPI ( HPI ) 19+02.409 142870.014 1301715.447
CC ( CC ) 142247.433 1302185.488
PT ( PT ) 21+05.827 142947.215 1301915.664
Radius: 750.000
Delta: 31.933° Right
Degree of Curvature (Arc): 7.639°
Length: 418.003
Tangent: 214.585
Chord: 412.614
Middle Ordinate: 28.933
External: 30.094
Back Tangent Direction: N36.981°E
Back Radial Direction: S53.019°E
Chord Direction: N52.948°E
Ahead Radial Direction: S21.086°E
Ahead Tangent Direction: N68.914°E
Element: Linear
PT ( PT ) 21+05.827 142947.215 1301915.664
PC ( PC ) 22+76.208 143008.512 1302074.636
Tangential Direction: N68.914°E
Tangential Length: 170.381
Element: Circular
PC ( PC ) 22+76.208 143008.512 1302074.636
HPI ( HPI ) 25+19.417 143096.010 1302301.561
CC ( CC ) 144314.772 1301570.965
PT ( PT ) 27+57.819 143254.915 1302485.679
Radius: 1400.000
Delta: 19.710° Left
Degree of Curvature (Arc): 4.093°
Length: 481.611
Tangent: 243.209
Chord: 479.240
Middle Ordinate: 20.659
External: 20.968
Back Tangent Direction: N68.914°E
Back Radial Direction: S21.086°E
Chord Direction: N59.059°E
Ahead Radial Direction: S40.796°E
Ahead Tangent Direction: N49.204°E
Element: Linear
PT ( PT ) 27+57.819 143254.915 1302485.679
PC ( PC ) 33+08.330 143614.600 1302902.439
Tangential Direction: N49.204°E
Tangential Length: 550.511
Element: Circular
PC ( PC ) 33+08.330 143614.600 1302902.439
HPI ( HPI ) 35+76.239 143789.643 1303105.257
CC ( CC ) 144068.825 1302510.418
PT ( PT ) 38+12.272 144057.504 1303110.312
Radius: 600.000
Delta: 48.123° Left
Degree of Curvature (Arc): 9.549°
Length: 503.942
Tangent: 267.909
Chord: 489.259
Middle Ordinate: 52.135
External: 57.096
Back Tangent Direction: N49.204°E
Back Radial Direction: S40.796°E
Chord Direction: N25.143°E
Ahead Radial Direction: S88.919°E
Ahead Tangent Direction: N1.081°E
Element: Linear
PT ( PT ) 38+12.272 144057.504 1303110.312
PC ( PC ) 39+35.269 144180.479 1303112.632
Tangential Direction: N1.081°E
Tangential Length: 122.997
Element: Circular
PC ( PC ) 39+35.269 144180.479 1303112.632
HPI ( HPI ) 40+69.875 144315.061 1303115.172
CC ( CC ) 144159.724 1304212.436
PT ( PT ) 42+03.149 144445.060 1303150.088
Radius: 1100.000
Delta: 13.953° Right
Degree of Curvature (Arc): 5.209°
Length: 267.880
Tangent: 134.606
Chord: 267.219
Middle Ordinate: 8.144
External: 8.205
Back Tangent Direction: N1.081°E
Back Radial Direction: S88.919°E
Chord Direction: N8.058°E
Ahead Radial Direction: S74.966°E
Ahead Tangent Direction: N15.034°E
Element: Linear
PT ( PT ) 42+03.149 144445.060 1303150.088
PC ( PC ) 43+54.201 144590.941 1303189.271
Tangential Direction: N15.034°E
Tangential Length: 151.052
Element: Circular
PC ( PC ) 43+54.201 144590.941 1303189.271
HPI ( HPI ) 45+77.588 144806.682 1303247.216
CC ( CC ) 144850.337 1302223.500
PT ( PT ) 47+93.758 145026.573 1303207.848
Radius: 1000.000
Delta: 25.185° Left
Degree of Curvature (Arc): 5.730°
Length: 439.557
Tangent: 223.387
Chord: 436.027
Middle Ordinate: 24.054
External: 24.647
Back Tangent Direction: N15.034°E
Back Radial Direction: S74.966°E
Chord Direction: N2.442°E
Ahead Radial Direction: N79.849°E
Ahead Tangent Direction: N10.151°W
Element: Linear
PT ( PT ) 47+93.758 145026.573 1303207.848
PC ( PC ) 49+05.276 145136.345 1303188.194
Tangential Direction: N10.151°W
Tangential Length: 111.518
Element: Circular
PC ( PC ) 49+05.276 145136.345 1303188.194
HPI ( HPI ) 50+11.502 145240.908 1303169.474
CC ( CC ) 145330.204 1304270.977
PT ( PT ) 51+17.070 145347.121 1303171.107
Radius: 1100.000
Delta: 11.032° Right
Degree of Curvature (Arc): 5.209°
Length: 211.794
Tangent: 106.226
Chord: 211.467
Middle Ordinate: 5.093
External: 5.117
Back Tangent Direction: N10.151°W
Back Radial Direction: N79.849°E
Chord Direction: N4.635°W
Ahead Radial Direction: S89.119°E
Ahead Tangent Direction: N0.881°E
Element: Linear
PT ( PT ) 51+17.070 145347.121 1303171.107
END ( END ) 58+85.783 146115.742 1303182.930
Tangential Direction: N0.881°E
Tangential Length: 768.712
Vertical Alignment Review Report
Report Created: Wednesday, September 3, 2025 Time: 8:21:49 AM
Project: Design SurvFt
Description:
File Name: c:\pw-work\d0510526\waa-skaman92135-1_ali.dgn
Last Revised: 9/3/2025 08:11:53
Note: All units in this report are in feet unless specified otherwise.
Horizontal Alignment: ALI_MAIN_01
Horizontal Description:
Horizontal Style: Alignment\Baseline
Vertical Alignment: PRO_MAIN_01
Vertical Description:
Vertical Style: Alignment\Baseline
Station Elevation
Element: Linear
START 10+00.000 304.256
VPI 11+00.000 310.556
Tangent Grade: 6.300%
Tangent Length: 100.000
Element: Linear
VPI 11+00.000 310.556
VPI 12+49.003 319.562
Tangent Grade: 6.044%
Tangent Length: 149.003
Element: Linear
VPI 12+49.003 319.562
VPC 13+00.000 322.599
Tangent Grade: 5.956%
Tangent Length: 50.997
Element: Symmetrical Parabola
VPC 13+00.000 322.599
VPI 14+75.788 333.069
VPT 16+51.576 344.024
Length: 351.576
Entrance Grade: 5.956%
Exit Grade: 6.232% r = 100 * (g2 - g1) / L: 0.078
K = l / (g2 - g1): 1275.156
Horizontal Alignment: ALI_MAIN_01
Horizontal Description:
Horizontal Style: Alignment\Baseline Middle Ordinate: 0.121
Element: Linear
VPT 16+51.576 344.024
VPC 18+01.732 353.381
Tangent Grade: 6.232%
Tangent Length: 150.155
Element: Symmetrical Parabola
VPC 18+01.732 353.381
VPI 22+01.732 378.308
VPT 26+01.732 390.720
Length: 800.000
Entrance Grade: 6.232%
Exit Grade: 3.103% r = 100 * (g2 - g1) / L: -0.391
K = l / (g2 - g1): 255.712
Middle Ordinate: -3.129
Element: Linear
VPT 26+01.732 390.720
END 27+08.000 394.018
Tangent Grade: 3.103%
Tangent Length: 106.268
File details come from the government source that posted it. Updated .