47°32′14″N 121°49′03″W ELEV. 2847m

SLAVE.QUEST

ALPINE SURVEY DOCUMENTATION — FIELD REGISTRY v.MMXXVI

GRID REF: NW-47-121 · DATUM: WGS84 · SCALE 1:50,000
DESCEND
FIELD NOTES — SECTOR 02

TERRAIN REPORT

The upper basin presents a mixed-conifer composition above the 2200m contour line, transitioning to sub-alpine fir stands at intermediate elevation. Survey instrumentation recorded persistent magnetic deviation of 2.3° east, attributed to subsurface magnetite deposits along the primary fault structure.

Traverse conditions: moderate technical exposure on northeast aspects. Rock quality grades as FAIR to POOR on the standard Yosemite Decimal System substrate index. Ice presence confirmed on north-facing couloirs above 2600m through late survey season.

Primary access: Forest Service Road 47-NW, terminal at trailhead registry point NW-47-121. Secondary approach via ridgeline traverse from adjacent grid sector, marked on Chart Series 7400-NW.

ELEVATION PROFILE
2847m peak
2614m saddle
1820m base
COORDINATES
47°32′14″N
121°49′03″W
SURVEY DATE
2026-05-09
PARTY SIZE
4 surveyors
MAGNETIC VAR.
2.3° E
DATUM
WGS84
TOPOGRAPHIC SURVEY — SUMMIT APPROACH

SUMMIT
RECORD

Cartographic documentation of the primary massif. All contour intervals represent 50m vertical separation. Index contours at 250m intervals are annotated with elevation figures in standard survey notation.

2847
METRES — PEAK ELEVATION
312°
DEGREES — TRUE BEARING
1027
METRES — VERTICAL GAIN
DETAIL REGISTRY — FIELD DATA CATALOGUE

EXPEDITION
REGISTRY

SURVEY CLASS
Primary Triangulation — Class I
Standard geodetic precision, max error ±0.5m
INSTRUMENT TYPE
Total Station — Electronic Theodolite
Sokkia SET530R3, angular accuracy 3″
REFERENCE SYSTEM
North American Datum 1983
NAD83 / UTM Zone 10N — EPSG:26910
VEGETATION ZONE
Sub-Alpine Fir — Engelmann Spruce
Transitional ecotone at 2100–2400m
ROCK FORMATION
Quartz Diorite — Late Cretaceous
Batholith intrusion, moderate jointing
DRAINAGE BASIN
Snoqualmie River — Upper Watershed
Basin area: 847 km², perennial flow
CLIMATE RECORD
Pacific Maritime — Montane Subtype
Mean annual precip: 2847mm, snow-dominated
CHART SERIES
USGS 7.5-Minute Quadrangle Series
Snoqualmie Pass Quad, 1986 / 2019 rev.
ACCESS STATUS
Unrestricted — USFS Permit Required
Alpine Lakes Wilderness Area boundary