Clyde River

Physical characteristics

Latitude (ºS)-35.71
Longitude (ºE)150.18
Catchment area (km2)11722.9
Estuary area (km2)1,217.5
Estuary volume (ML)350736.6
Average depth (m)43.0
Roy et al. (2001) classification5II/3/B
Entrance condition6O
  1. Derived from DECCW (2010) NSW estuaries and coastal catchments spatial database.
  2. Includes area mapped as open water (see note 1), mangrove and saltmarsh areas (Creese R. G., Glasby T. M., West G. and Gallen C. (2009) Mapping the habitats of NSW estuaries. Industry & Investment NSW Fisheries Final Report Series 113. Port Stephens, NSW, Australia.
  3. Based on areas at 0.6 m AHD (Roper T., Creese B., Scanes P., Stephens K., Williams R., Dela-Cruz J., Coade G. and Coates B. (2011) Assessing the condition of estuaries and coastal lake ecosystems in NSW. Office of Environment and Heritage, Sydney).
  4. Estimated by dividing the total volume at 0.6 m AHD by the total surface area of the estuary including mangrove areas but excluding saltmarsh (Roper et al., 2011)
  5. Estuary group: I = oceanic embayment, II = tide dominated estuary, III = wave dominated estuary, IV = intermittently closed estuary V = freshwater bodies
    Estuary type: 1 = ocean embayments, 3 = drowned valley estuary, 5 = barrier estuary, 6 = barrier lagoon, 7 = interbarrier estuary, 8 = saline coastal lagoon, 9 = small coastal creeks, 11 = brackish barrier lake. Evolution stage: A=youthful, B=intermediate, C=semi-mature, D=mature.
    (P. S. Roy, R. J. Williams, A. R. Jones, I. Yassini, P. J. Gibbs, B. Coates, R. J. West, P. R. Scanes, J. P. Hudson and S. Nichol (2001) Structure and Function of South-east Australian Estuaries. Estuarine, Coastal and Shelf Science 53, 351-384)
  6. Entrance conditions: O = open, T = trained, I = intermittent.

Tidal prism

The volume of water moving past a fixed cross section during each flood tide or ebb tide (i.e. slack water to slack water), is referred to as the tidal prism of an estuary.

The following table shows the measured tidal prism at the location specified, along with the tidal range for near the measurement site and at Sydney Harbour.

Location:     50m upstream of Princes Highway bridge on 26/9/96

Tide stateFlow
(106 m3
tidal range (m)
Sydney Harbour
tidal range (m)
Ebb flow18.741.281.42
Flood flow 20.361.441.58

Tidal survey

Tidal surveys measure the hydrodynamic behaviour of an estuary during a full tidal cycle. The parameters measured include velocity, water levels, salinity, temperature and pH.

The following tidal surveys have been undertaken on this estuary. A map shows the location and plots of the flows and water levels for the most comprehensive survey.

Copies of tidal survey reports are available from the Estuary Management Program

DateData collectedFigureReport
Sep to Oct 1996Extensive data collection: water levels at fifteen sites, velocities at five sites, in situ water quality at three sites and thirty-four water quality profiles.1988-49.pdfMHL792
Sep 1996 to Sep 1997Nelligen Clyde River Water Quality Monitoring 1997.-MHL889

Hydrographic survey

The hydrographic survey provides the depth and physical characteristics of the estuary.

The metadata associated with the survey can be found on the map sheets provided.

Map sheet number DescriptionScale    Size
53592S1.pdfIndex plan & cross section locations1:10000238.9kb
53592S2.pdfIndex plan & cross section locations1:10000205.9kb
53592S3.pdfIndex plan & cross section locations1:10000260.0kb
53592S4.pdfCross sections - Clyde River (Princes Highway)1:2000 H 1:200 V339.4kb
53592S5.pdfCross sections - Clyde River (Snapper Point to Chinamans Point)1:2000 H 1:200 V398.5kb
53592S6.pdfCross sections - Clyde River (Chinamans Point to Big Island)1:2000 H 1:200 V323.9kb
53592S7.pdfCross sections - Clyde River (Big Island to Little Island)1:2000 H 1:200 V269.8kb
53592S8.pdfCross sections - Clyde River (upstream of Little Island)1:2000 H 1:200 V318.3kb
53592S9.pdfCross sections - Clyde River (Nelligen)1:2000 H 1:200 V259.3kb
53592S10.pdfCross sections - Clyde River (upstream of Nelligen)1:2000 H 1:200 V249.0kb
53592S11.pdfCross sections - Clyde River (Currowan Creek)1:2000 H 1:200 V264.2kb
53592S12.pdfCross sections - Clyde River (Shallow Crossing)1:2000 H 1:200 V199.4kb
53592S13.pdfCross sections - Clyde River (Waterfall Creek & Buckenbowra River)1:2000 H 1:200 V203.6kb
53592S14.pdfCross sections - Clyde River (Nelligen Creek, Cyne Mallows Creek, Currowan Creek & Cockwhy Creek)1:2000 H 1:200 V180.2kb
53592.txtClyde River xyz dataN/A380.1kb
Page last updated: 26 April 2012