OFFICIAL HYDROGRAPHIC OBSERVATION REPORT NZ

Grey River / Māwheranui Water Level & Telemetry

Gauge Station: Grey River at Dobson • South Island• New Zealand

● NORMAL FLOW

Water Level (STAGE)

60.50 m

Normal Band: 110.0 – 1100.0 m

Discharge / Flow

605 m³/s

Historical Peak: 8,500 m³/s

Elevation

— ft

Elevation above sea level

VERIFIED TELEMETRY • SOURCE: LAWA & NIWA • GAUGE ID: NZ-WTC-089@-42.4500,171.3000 • COORD: -42.450°, 171.300°

OBSERVED: Oct 1, 2026, 5:52 PM

Grey River / Māwheranui Where It Flows & Gauge Station

HYDROGRAPHIC MAP & GAUGING LOCATION

PRECIPITATION RADAR

GEOGRAPHIC COURSE & HYDROLOGICAL REACH

Where It Flows: Grey River / Māwheranui

The Grey River / Māwheranui is a vital waterway situated within New Zealand, flowing predominantly across the South Island basin. It forms an integral artery of the Grey Valley Basin drainage basin. Along its course, it navigates through or proximate to Greymouth, providing municipal drainage, agricultural sustenance, and freshwater habitat. Continuous hydrological surveillance at the Grey River at Dobson gauging station (coordinates: -42.4500°N, 171.3000°W) allows real-time quantification of upstream runoff, seasonal snowmelt pulses, and meteorological flood crests.

COUNTRY

New Zealand

REGION / STATE

South Island

CATCHMENT BASIN

Grey Valley Basin

GAUGING LOCATION

Greymouth

MONITORING STATIONS & GAUGES ALONG (1) UPSTREAM & DOWNSTREAM POINTS

Station / Location	REGION / STATE	Coordinates	Station ID	Action
Grey River at Dobson CURRENT GAUGE	South Island	-42.450°, 171.300°	NZ-WTC-089@-42.4500,171.3000	Viewing

FREQUENTLY ASKED QUESTIONS ABOUT WATER LEVELS

Frequently Asked Questions About Water Levels: Grey River / Māwheranui

What is the current Grey River / Māwheranui water level today? ↓

As of the latest continuous telemetry report, the Grey River / Māwheranui water level at Grey River at Dobson is measured at baseline with an observed discharge of 605 m³/s.

Where is the official monitoring gauge for Grey River / Māwheranui located? ↓

The primary monitoring station for Grey River / Māwheranui is located at coordinates -42.4500° Latitude and 171.3000° Longitude near Greymouth in South Island. Telemetry is recorded under site identifier NZ-WTC-089@-42.4500,171.3000.

What are normal water levels and flood stages for Grey River / Māwheranui? ↓

Typical hydrological levels on the Grey River / Māwheranui generally fluctuate within 110.0 m and 1100.0 m. When stage exceeds these parameters, localized bank overflow and flood advisories may be triggered.

Where does the Grey River / Māwheranui flow? ↓

The Grey River / Māwheranui courses through New Zealand across the South Island basin, draining into the Grey Valley Basin. It provides critical natural drainage and freshwater replenishment across its catchment reach.