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B1 The Heads

Active Physico-Chemical 09-11-2007 - 20-05-2026

Barwon River Estuary

267 results found (Displaying 1 - 25)
Date Status Details
20 May 2026 Approved Notes:

We were surprised Willy Weather indicated low tide was at 07.15. Two hours later the  outward current was still very strong. 
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 0.0 7.5 14.40 37.30 9.80 94.5 53.30
1.7m 0.0 7.9 14.40 37.30 9.70 93.8 53.30
15 Apr 2026 Approved Notes:

channel out to sea appears wider and is shallower due to sand movement making, boating unavailable at low tide.
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.5 16.50 38.80 9.99 101.1 55.40
2.3m 9.0 7.4 16.60 38.60 9.76 98.9 55.20
8 Apr 2026 Approved Notes:

Additional depth measurements are a result of the fast moving tide draging the probe sideways. 
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 8.2 17.00 38.40 8.90 91.3 54.90
2.5m 9.0 8.2 17.00 38.40 8.85 90.0 54.90
18 Mar 2026 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 8.6 18.50 61.30 54.60 8.3 87.60
1.9m 9.0 8.4 18.50 61.80 54.60 8.4 88.30
5 Mar 2026 Approved Notes:

Seagrass floating in outgoing tide.
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.8 19.30 38.70 7.93 85.4 55.30
1.9m 9.0 8.2 19.30 38.60 7.85 84.6 55.20
18 Feb 2026 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.3 18.70 38.30 7.70 82.5 54.70
2.0m 9.0 79.0 18.40 38.20 7.63 81.3 54.60
5 Feb 2026 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.9 19.00 38.60 7.99 85.1 55.20
2.5m 9.0 7.7 18.90 38.60 7.89 84.0 55.20
21 Jan 2026 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 8.0 18.00 38.00 8.34 88.2 54.30
1.9m 9.0 7.5 18.00 38.10 8.37 88.1 54.40
1 Jan 2026 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.9 17.90 38.40 9.50 99.3 54.90
2.5m 9.0 8.2 17.90 38.40 9.40 98.3 54.80
17 Dec 2025 Approved Notes:

Laqua meter calibration did not work. Error 4. We gently tried cleaning but still did not work. Indicates membrane may need replacing.  We used ph testing strips.

Many Portuguese Man o war are littering the beaches.
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 8.0 17.30 43.50 9.25 95.1 62.20
2.7m 9.0 8.0 17.30 37.20 9.34 96.2 53.20
4 Dec 2025 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.7 17.00 36.50 9.45 98.0 52.10
2.5m 9.0 8.2 16.70 37.00 9.39 96.5 52.80
19 Nov 2025 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 8.1 16.00 36.80 9.82 99.4 52.60
2.5m 9.0 8.3 16.00 36.80 9.81 99.1 52.60
6 Nov 2025 Approved Notes:

Calm and sunny
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.8 15.30 35.30 9.34 92.7 50.40
2.5m 9.0 7.7 15.30 35.30 9.30 92.3 50.50
15 Oct 2025 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.9 14.30 37.90 10.24 98.9 54.20
2.5m 9.0 8.2 14.40 37.80 10.22 98.7 54.00
2 Oct 2025 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.2 13.20 38.20 10.06 96.2 54.60
3.5m 9.0 7.8 13.20 38.20 9.97 95.7 54.50
4 Sep 2025 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 6.6 13.00 37.90 11.10 104.5 54.10
3.5m 9.0 8.4 13.10 37.80 11.02 104.1 54.00
20 Aug 2025 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.5 12.20 38.40 11.24 102.2 54.90
2.5m 9.0 7.8 12.50 38.30 11.10 101.8 54.70
7 Aug 2025 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.9 12.30 38.10 10.95 99.8 54.40
2.5m 9.0 8.2 12.30 38.00 10.84 99.2 54.30
16 Jul 2025 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.9 11.20 35.50 10.49 94.7 50.70
1.9m 9.0 8.2 11.20 35.40 10.44 94.2 50.60
3 Jul 2025 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.3 13.40 37.60 10.23 97.2 53.70
2.5m 9.0 8.0 13.40 37.50 10.15 96.2 53.60
18 Jun 2025 Approved Notes:

As the current was very fast, we only took two depth measurements as we did not want to risk damaging the probe. Maximum depth could not be ascertained.

Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.0 10.90 34.20 10.59 93.6 48.90
0.5m 9.0 7.0 10.90 34.20 10.53 93.3 48.90
5 Jun 2025 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 8.1 13.50 38.40 10.26 96.8 54.90
3.2m 9.0 7.4 13.70 38.30 10.09 95.6 54.70
21 May 2025 Approved Notes:

Very low tide
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.8 12.80 38.20 10.05 92.9 54.60
2.4m 9.0 7.6 13.00 38.10 9.93 92.1 54.40
1 May 2025 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 10.0 7.7 16.30 38.00 9.30 92.6 54.30
2.5m 10.0 7.8 16.30 38.00 9.25 92.2 54.30
16 Apr 2025 Approved Notes:

workmen in barge - installation of new beacons. Fast outgoing tide.
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.8 18.80 39.00 8.41 89.3 55.70
1.8m 9.0 8.0 18.80 39.00 8.37 88.9 55.70
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