WxDecoder

78U Weather Snake River Seaplane Base

Lewiston, IdahoElevation 735 ftSeaplane base
OFF-FIELD REFERENCE
Nearest report: KLWS · 2 NM E · 41 min old
No ceiling, visibility 10 SM.
No on-field report, so no field flight category. Conditions at the field may differ.
OFF-FIELD REFERENCE · KLWS
WIND
100@7
steady
VISIBILITY
10 SM
16.1 km
CEILING
None
no BKN/OVC layer
FORECAST & PILOT NOTES · SUPPLEMENTAL

Extended forecast and pilot notes

No aviation METAR is published for this airport. The nearest National Weather Service station reports wind from 90° at 8 kt, visibility 10 SM, temperature 17C. Treat this as supplemental, not an aviation observation. Forecast suggests this afternoon mostly sunny, high near 67F, low near 42F, 23% chance of precipitation. Key risks: no significant hazards are highlighted right now, but always confirm against an official briefing.

DayConditionsTemp FWindGustsPrecipPilot note
This Afternoon Mostly Sunny 67/42 E 6 kt – 23%
Monday Light Rain 58/43 W 3 kt – 87%
Tuesday Chance Light Rain 59/41 SW 6 kt – 44%
Wednesday Light Rain Likely 56/37 SW 5 kt – 64%
Thursday Chance Light Rain 55/36 NE 2 kt – 28%
Friday Chance Light Rain 53/33 N 1 kt – 25%
Saturday Partly Sunny 54/33 N 1 kt – 16%

Source: National Weather Service (office OTX). Forecast issued 2136Z.

Radar

Radar data: NOAA/NWS MRMS composite reflectivity. For situational awareness only, not a substitute for an official weather briefing.

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RUNWAYS & WIND
Crosswind calculator
No runway layout is available for 78U. Enter a runway number or heading to estimate wind components.
RUNWAYS

Runway detail & declared distances

1 runway · longest 3,000 ft

N/S
Dimensions
3,000 x 150 ft
Surface
Water
RWY N
RWY S

Runway data from the FAA NASR dataset (effective 2026-06-11). Verify with the current Chart Supplement and NOTAMs.

FIELD CONDITIONS

Field elevation

Field elevation
735 ft MSL

Density and pressure altitude need a current temperature and altimeter from the METAR.

DAYLIGHT & NIGHT

Sun & logging windows

Sunset
0044Z 5:44 PM
Sunrise
1420Z 7:20 AM
Loggable night
0115Z (6:15 PM local) → 1349Z (6:49 AM local)
end of evening to start of morning civil twilight
Position lights required
0044Z (5:44 PM local) → 1420Z (7:20 AM local)
sunset to sunrise (91.209)
Night passenger currency
0144Z (6:44 PM local) → 1320Z (6:20 AM local)
1 hr after sunset to 1 hr before sunrise (61.57(b))

FAA definitions, shown in Zulu with airport-local time. Verify for your operation.

AIRPORT INFORMATION

Facility & services

Snake River Seaplane Base is in Lewiston, Idaho. Field elevation 735 ft MSL. Airport facts are drawn from OurAirports and the FAA NASR dataset.

OPERATIONS & CONTACT
OwnershipPublicly owned
UseOpen to the public
TypeSeaplane base
ManagerHELLS GATE STATE PARK - JEFF SMITH
Manager phone208-799-5015
AttendedAPR-OCT ALL, 0700–DUSK
CHARTS & AIRSPACE
ICAO / IATA78U
SectionalSEATTLE
Center (ARTCC)SEATTLE
Flight service (AFSS)BOISE
RegionIdaho
CountryUnited States
Coordinates46.3646, -117.0620
Distance from city3 NM SW
SERVICES & LIGHTING
Control towerNon-towered
CTAF122.900
FREQUENCIES

Communications

122.900
CTAF
CTAF

Not all tower/ground/approach frequencies are in our datasets. Verify with the FAA Chart Supplement.

AIRCRAFT ACTIVITY

Traffic patterns

Aircraft activity data is not available for this airport yet.

NEARBY AIRPORTS

Weather reference stations

78U has no on-field report. Nearest reporting station: KLWS (2 NM E, VFR).

KLWS Lewiston Nez Perce County Airport
2 NM E
VFR
KPUW Pullman-Moscow Regional Airport
23 NM N
VFR
KGIC Idaho County Airport
47 NM SE
VFR
KALW Walla Walla Regional Airport
53 NM W
VFR
KLGD La Grande/Union County Airport
76 NM SW
VFR
KGEG Spokane International Airport
78 NM N
VFR
AIRPORT REMARKS

Operational remarks

›ACFT MAY DOCK AT MARINA - NORTH OF CAMPGND. IF SPACE IS AVBL.
›LNDG AREA WITHIN LEWISTON-NEZ PERCE COUNTY ARPT TFC AREA; CTC LWS ATCT ON TWR/CTAF 119.4.
›NO BEACHING GEAR OR MOORING BUOYS AVBL.
›FOR CD CTC SEATTLE ARTCC AT 253-351-3694.
›WATERLANE LENGTH AND WIDTH VARIES.
›HEAVY BOAT TFC INVOF SEAPLANE BASE.
›PLINES X SNAKE RIVER NORTH, SOUTH, ABV & BLO LNDG AREA. BRIDGE ACROSS SNAKE RIVER 2 NM NORTH OF LNDG AREA.
OFFICIAL LINKS & SOURCES
↗Search NOTAMs (official FAA NOTAM Search)
↗78U on OurAirports
FREQUENTLY ASKED
Does 78U have a METAR?
No on-field METAR is issued for 78U. This page uses the nearest reporting station as a reference.
Does 78U have a TAF?
No TAF is issued directly for 78U. Use the nearest TAF-issuing field as a planning reference.
What is the field elevation at 78U?
78U sits at 735 ft MSL, which factors into the density-altitude estimate on this page.
Is this an official preflight weather briefing for 78U?
No. wxdecoder.com is for education and situational awareness only. It is not an official weather briefing or a substitute for official sources, NOTAM review, and pilot judgment.
This app is for aviation weather education, training, and situational awareness only. It is not a substitute for an official weather briefing, approved flight-planning software, flight service, dispatch procedures, current FAA regulations, or pilot judgment. Always verify weather with official sources before flight.