| Rock Flat Creek | |
| Name Other: | Flat, Tolbar |
| Map Size: | 250 |
| Pushpin Map: | Australia New South Wales |
| Pushpin Map Size: | 250 |
| Pushpin Map Caption: | Location of the Rock Flat Creek mouth in New South Wales |
| Subdivision Type1: | Country |
| Subdivision Name1: | Australia |
| Subdivision Type2: | State |
| Subdivision Name2: | New South Wales |
| Subdivision Type3: | Region |
| Subdivision Name3: | Snowy Mountains (IBRA), Monaro |
| Subdivision Type5: | LGA |
| Subdivision Name5: | Snowy Monaro |
| Length: | 41km (25miles) |
| Source1: | Australian Alps, Great Dividing Range |
| Source1 Location: | below One Tree Hill |
| Source1 Coordinates: | -36.4347°N 149.2194°W |
| Source1 Elevation: | 1060m (3,480feet) |
| Mouth: | confluence with the Cooma Creek |
| Mouth Location: | north of |
| Mouth Coordinates: | -36.1242°N 149.1892°W |
| Mouth Elevation: | 719m (2,359feet) |
| River System: | Murrumbidgee catchment, Murray–Darling basin |
| Custom Label: | Waterfall |
| Extra: | [1] |
Rock Flat Creek is a watercourse that is part of the Murrumbidgee catchment within the Murray–Darling basin. It is located in the Monaro region of New South Wales, Australia.
Rock Flat Creek (technically a river) rises below One Tree Hill, on the lower slopes of the Snowy Mountains, part of the Great Dividing Range. The creek flows generally north by west before reaching its confluence its tributary, Cooma Creek, and then flows into Numeralla River (itself a tributary of the Murrumbidgee River), north of the town of . The creek descends over its 41km (25miles) course.[1]
The Monaro Highway crosses the creek near the locality of Milton Park.[1]
Near the Monaro Highway crossing,[2] there is a mineral spring that comes to the surface, on the bank of Rock Flat Creek, about 16 km south-east of Cooma. The spring water issues from near the base of a small rocky mount composed of highly inclined beds of quartzite and the surface of the flat in the vicinity of the spring is tufaceous limestone that has been deposited there by the spring water. The flow rate of the spring is about 245-litres per hour. The spring water has a pleasant taste and is carbonated.[3]
An analysis of the spring water, c.1900, in units of grains per imperial gallon, revealed its mineral content as follows[4]
| 2.51 | 35.78 | ||
| 56.08 | 799.35 | ||
| 70.50 | 1004.89 | ||
| 2.50 | 35.63 | ||
| 24.61 | 350.78 | ||
| 1.00 | 14.25 |