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H1 Site one (Hopkins River Bridge)

17 October 2025

Observation details

Overview

Estuary Hopkins River Estuary
Site Site one (Hopkins River Bridge)
Observation ID #17249
Date and Time Friday 17th October 2025 17:00pm
Approved Approved

Notes

DO supersaturated at the top and nearly anoxic at the bottom! Very dramatic oxycline.

Depth Profiling

Depth m Temperature °C Salinity ppt D.O. mg/L D.O. % sat EC mS/cm Notes
0.1m 19.20 9.90 10.98 125.8 16.83
Previous 15.9 20.2 10.8 125.1 32.2
Median 17.2 12.30 9.24 99.90 20.5
0.5m 17.70 10.80 10.35 115.6 18.24
Previous 13.6 28.8 7.5 86.4 44.7
Median 17.2 11.70 9.13 99.60 19.6
1.0m 16.90 12.10 9.35 103.7 20.68
Previous 14.6 28.4 9.3 109.3 44.0
Median 16.7 21.20 8.52 97.00 33.7
1.5m 16.30 17.40 6.72 75.9 28.02
Previous 13.5 30.9 7.9 92.2 47.4
Median 16.7 21.10 8.52 97.00 33.4
2.0m 15.60 22.30 4.73 54.1 35.15
Previous 14.8 30.6 9.0 108.1 47.0
Median 16.0 27.30 7.70 89.60 42.5
2.5m 15.10 25.40 2.92 33.8 40.08
Previous 13.6 32.0 8.0 94.1 49.0
Median 16.1 27.30 7.70 89.60 42.5
3.0m 14.80 27.30 1.75 20.5 42.34
Previous 14.3 31.7 6.5 78.3 48.6
Median 16.0 31.30 6.62 79.90 48.1
3.5m 14.70 27.90 0.98 11.4 43.24
Previous 13.6 32.2 8.1 94.6 49.2
Median 16.0 31.30 6.62 79.90 47.9

Top-Bottom Sampling

Depth m Turbidity NTU pH
Top 0.1 12 8.1
Previous 0.1 11 7.9
Median 0.1 9 8.1
Bottom 3.5 11 7.7
Previous 3.2 9 7.8
Median 3.8 9 7.9

Other details

Max depth 3.60
Previous 4.00
Median 3.90
Flow estimate N/A

Observation Documents

Link Date File name Description

Preceding Observations

C Estuary is closed to the sea. O Estuary is open to the sea. P Perched
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