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  4. A5 Culvert on Coalmine Road
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A5 Culvert on Coalmine Road

Active Physico-Chemical 29-04-2007 - 21-10-2026

Anglesea River Estuary

204 results found (Displaying 1 - 25)
Date Status Details
21 Oct 2026 Pending Notes:

Depth 1.6m to bottom,  Approx 0.4m black sludge

Profuse algae (surface) upstream of Coalmine road.

pH upstream of culvert 3.3-3.4

No flow observable, but actually present at waterfall
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 3.4 18.10 7.59 82.0 6.50
1.2m 9.0 3.3 15.90 4.10 43.2 6.41
16 Sep 2026 Pending Notes:

Depth measured to top of black, sulphur smelling sludge always present5 at this site

Oxygen profile very unusual.

Low top level conductivity consistent with Marshy Ck  water at AV2

Downstream flow just discernible
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 3.3 12.30 5.03 47.6 5.93
1.3m 9.0 3.4 13.90 9.77 98.1 9.07
19 Aug 2026 Pending Notes:

Assisted by John Slykhuis

BW piping from well in Pony club was warm and steaming

Cloudy white area in NE corner on upstream side of culvert

Slow flow into estuary was visible

pH on North (upstream) side of culvert was 3.2

Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 3.3 12.60 3.08 30.5 6.96
1.0m 9.0 3.4 12.40 7.49 70.2 9.30
15 Jul 2026 Pending Notes:

Lots of Mosquito larvae
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 4.6 9.90
1.5m 9.0 4.5 10.10
17 Jun 2026 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 4.6 12.60 10.85 106.3 14.04
1.5m 9.0 4.6 11.50 6.76 65.5 14.56
20 May 2026 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 4.5 14.50 9.98 103.6 16.27
0.9m 9.0 4.3 15.70 9.90 105.4 16.77
15 Apr 2026 Approved Notes:

Max depth to top of black sludge layer
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 4.2 16.20 9.23 100.3 18.14
1.0m 9.0 4.2 16.00 7.32 79.3 18.19
18 Mar 2026 Approved Notes:

Assisted by John S

Black sludge from around 1m down

pH N side of Culvert =3.8
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 3.9 19.00 8.91 102.0 15.74
0.9m 9.0 4.1 19.80 8.06 94.4 19.01
18 Feb 2026 Approved Notes:

Max depth recorded to top of sludge.  Actually 2-300mm deeper

pH= 3.9 on other (North) side of culvert, clearer water

Assisted by John S
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 3.9 22.70 7.55 93.6 19.11
0.9m 9.0 3.9 22.70 7.42 92.2 19.11
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 3.5 23.10 4.88 60.2 15.66
1.0m 9.0 3.9 23.20 5.10 63.1 17.18
17 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 3.1 22.20 7.71 90.1 8.34
1.5m 9.0 3.3 21.00 7.25 86.7 14.36
19 Nov 2025 Approved Notes:

1.6m to sludge layer

Water unusually clear

Pinkish Red colour in top sample

Flow just visible in movement of underwater plants

Comments below relate to North Side of culvert

Very Red tinge but very clear   Floating green algae

Top pH 3.2

DEPTHTEMPDO %satDO mg/lEC mS/cm
0.115.238.83.796.59
0.716.6837.816.24

 

 

 

 
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 3.3 15.50 3.43 35.7 11.40
1.5m 9.0 3.7 18.70 8.47 95.7 14.99
15 Oct 2025 Approved Notes:

North side of Culvert

GREEN ALGAE floating on top, water has a redstain but clear

See photos attached

Readings on N Side at 0.5m depth

pH   3.1

Temp   16 C

DO       9.26 mg/l

DO%  93

EC   6.4  mS/cm

Water is flowing under bridge

 


Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 3.3 17.10 9.41 102.4 14.60
1.3m 9.0 3.8 18.10 9.83 110.0 17.82
17 Sep 2025 Approved Notes:

Upstream from A5 pH=3.1
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 3.7 13.80 9.76 100.2 16.76
1.0m 9.0 3.8 13.70 9.80 100.6 17.23
5 Sep 2025 Approved Notes:
  • Upstream of Coalmine road, the surface pH was 3.21 and the EC was 7.4 mS/cm.
  • Monitoring conducted by Corangamite CMA staff.  ProQuatro Multiparameter Meter was used. 

Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 3.6 14.10 7.90 6.93 70.5 13.60
1.3m 4.4 13.70 11.20 4.66 49.2 18.66
29 Aug 2025 Approved Notes:

pH 3.1 on North side of culvert

a Low flow is evident by movement of flocculated materisl

Black sludge about 300mm deep
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 3.3 12.40 7.40 72.3 9.23
1.0m 3.7 13.80 0.50 5.2 17.55
27 Aug 2025 Approved Notes:
  • large numbers of mosquito larvae observed at this site.
  • water was a iron (burnt orange) in colour upstream and downstream of Coalmine Road.  This was not seen at other monitoring sites. 
  • Monitoring conducted by Corangamite CMA staff.  ProQuatro Multiparameter Meter was used. 
  • Upstream of Coalmine Road, the top pH was 3.41 and the dissolved oxygen <5mg/L. 




Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 3.5 12.70 5.90 3.20 31.2 10.47
1.1m 4.7 13.60 12.90 0.68 6.1 21.42
22 Aug 2025 Approved Notes:
  • Observed a plume of black sediment after the weighted rope hit the bottom of the estuary.  It smelt rotten too.
  • An oily film of iron loving bacteria could be seen on the surface of the water.
  • Observed iron tinted water upstream of Coalmine Road.  There was also black ooze on the bottom.
  • top pH upstream of Coalmine Road was 3.26
  • Monitoring conducted by Corangamite CMA staff.  ProQuatro Multiparameter Meter was used. 

Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 4.5 11.00 8.10 7.15 68.5 14.04
1.0m 3.3 11.70 6.00 4.20 38.3 10.35
20 Aug 2025 Approved Notes:

Turb tube broken
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 4.1 9.90 8.54 78.7 14.05
1.4m 3.5 10.10 0.00 45.6 13.70
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 7.3 9.60 9.63 90.0 14.85
1.3m 9.0 6.9 11.80 3.54 33.9 15.05
18 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 7.7 9.30 10.21 94.3 15.64
1.4m 9.0 7.5 12.20 0.36 3.8 22.82
21 May 2025 Approved
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 8.0 9.20 9.55 93.7 30.37
0.9m 9.0 8.0 9.10 9.24 90.5 30.44
16 Apr 2025 Approved Notes:

>300mm of black sludge on bottom

Max depth is to sludge not real bottom
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.9 19.20 8.14 99.2 33.23
0.6m 9.0 7.9 18.50 7.02 84.6 33.22
19 Mar 2025 Approved
Anglesea_A5_19th_March_2025_.pdf
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.7 18.90 8.50 103.5 33.35
0.9m 9.0 7.8 18.60 7.99 96.4 33.32
19 Feb 2025 Approved
Anglesea_A5_19th_Feb._2025_.pdf
Depth Turb NTU pH Temp ° C Salin ppt D.O. mg/L D.O. % sat EC mS/cm
0.1m 9.0 7.8 18.60 8.16 98.8 30.97
0.6m 9.0 7.8 19.20 7.15 87.5 31.05
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