WxDecoder

MA74 Weather Larson's Seaplane Base

Tyngsboro, MassachusettsElevation 90 ftSeaplane base
OFF-FIELD REFERENCE
Nearest report: KASH · 7 NM NW · 29 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 · KASH
WIND
Calm
no steady wind
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 130° at 3 kt, visibility 10 SM, temperature 15C. Treat this as supplemental, not an aviation observation. Forecast suggests this afternoon sunny, high near 67F, low near 29F, 0% chance of precipitation. Key risks: no significant hazards are highlighted right now, but always confirm against an official briefing.

DayConditionsTemp FWindGustsPrecipPilot note
This Afternoon Sunny 67/29 SW 4 kt – 0%
Monday Widespread Frost then Sunny 69/41 W 4 kt – 0%
Tuesday Sunny 55/27 N 4 kt – 0%
Wednesday Widespread Frost then Sunny 56/35 0 kt – 0%
Thursday Sunny 66/47 SW 9 kt – 3%
Friday Sunny 69/42 W 4 kt – 2%
Saturday Mostly Sunny 65/44 W 4 kt – 5%

Source: National Weather Service (office BOX). Forecast issued 1624Z.

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 MA74. Enter a runway number or heading to estimate wind components.
RUNWAYS

Runway detail & declared distances

1 runway · longest 2,500 ft

13W/31W
Dimensions
2,500 x 400 ft
Surface
Water
RWY 13W
RWY 31W

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
90 ft MSL

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

DAYLIGHT & NIGHT

Sun & logging windows

Sunset
2148Z 5:48 PM
Sunrise
1111Z 7:11 AM
Loggable night
2217Z (6:17 PM local) → 1042Z (6:42 AM local)
end of evening to start of morning civil twilight
Position lights required
2148Z (5:48 PM local) → 1111Z (7:11 AM local)
sunset to sunrise (91.209)
Night passenger currency
2248Z (6:48 PM local) → 1011Z (6:11 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

Larson's Seaplane Base is in Tyngsboro, Massachusetts. Field elevation 90 ft MSL. Airport facts are drawn from OurAirports and the FAA NASR dataset.

OPERATIONS & CONTACT
OwnershipPrivately owned
UsePrivate use
TypeSeaplane base
ManagerKAREN M. TAFT
Manager phone978-649-7172
AttendedDaily, DALGT
CHARTS & AIRSPACE
ICAO / IATAMA74
SectionalNEW YORK
Center (ARTCC)BOSTON
Flight service (AFSS)BRIDGEPORT
RegionMassachusetts
CountryUnited States
Coordinates42.6915, -71.4181
Distance from city1 NM NE
SERVICES & LIGHTING
Control towerNon-towered
AIRCRAFT ACTIVITY

MA74 traffic patterns

2026-07-15 to 2026-10-03, 8 days observed · data 2026-10-23

Low confidence
TRAFFIC VOLUME (30-DAY)
AVG LANDINGS/DAY
2
AVG OPS/DAY
3.7
Activity trend over 3 days: falling, from 3 to 2 operations per dayOperations trend (3 days)

Busiest day: Mon · Busiest month: Sep

FLEET MIX
Piston single 73%Helicopter 27%

Mostly small piston aircraft.

TOP AIRCRAFT TYPES
›BL8 (Piston single) · ~3 landings/mo
›B06 (Helicopter) · ~1 landings/mo
LIKELY BASED AIRCRAFT
Low-confidence estimate

Aircraft likely based near this airport (estimate), mostly single-engine piston aircraft.

›BL8 (Piston single)

This is an estimate based on repeated flight patterns, not registration data. Do not rely on it to identify specific aircraft or owners.

Data limitations (4)
›ADS-B coverage is incomplete; counts are an observed lower bound, not official totals.
›Some aircraft do not transmit usable ADS-B and are not counted.
›Aircraft types and based estimates are inferred and may be wrong.
›This is not official ATC, FAA, or airport data.
NEARBY AIRPORTS

Weather reference stations

MA74 has no on-field report. Nearest reporting station: KASH (7 NM NW, VFR).

KASH Nashua Airport / Boire Field
7 NM NW
VFR
KLWM Lawrence Municipal Airport
13 NM E
VFR
KBED Laurence G Hanscom Field
14 NM SE
VFR
KMHT Manchester-Boston Regional Airport
14 NM N
VFR
KBVY Beverly Regional Airport
23 NM E
VFR
KAFN Jaffrey Airfield Silver Ranch Airport
27 NM W
VFR
AIRPORT REMARKS

Operational remarks

›VFR WX CONDS ONLY.
›FOR CD CTC BOSTON APCH AT 603-594-5551.
OFFICIAL LINKS & SOURCES
↗Search NOTAMs (official FAA NOTAM Search)
↗MA74 on OurAirports
FREQUENTLY ASKED
Does MA74 have a METAR?
No on-field METAR is issued for MA74. This page uses the nearest reporting station as a reference.
Does MA74 have a TAF?
No TAF is issued directly for MA74. Use the nearest TAF-issuing field as a planning reference.
What is the field elevation at MA74?
MA74 sits at 90 ft MSL, which factors into the density-altitude estimate on this page.
Is this an official preflight weather briefing for MA74?
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.