Gentle boating activity on Canberra's lake Burley Griffin. Sam Thomson takes his three sons Angus (5), Max (9) and Josh (10) out for some holiday fishing on the Lake.

Gentle boating activity on Canberra's lake Burley Griffin. Sam Thomson takes his three sons Angus (5), Max (9) and Josh (10) out for some holiday fishing on the Lake. Photo: Karleen Minney

Swimmers have been given the all clear to dive into the waters of Lake Burley Griffin.

But the National Capital Authority has reminded the boating public of restrictions on the type of engines that can be used on the waterway.

As pleasure boats took to the lake in Thursday's sunshine, it warned that generally only craft driven by electric engines were allowed on the lake.

Sam Thomson takes his three sons Angus (5), Max (9) and Josh (10) out for some holiday fishing on the Lake. Click for more photos

Summer boating

Sam Thomson takes his three sons Angus (5), Max (9) and Josh (10) out for some holiday fishing on the Lake. Photo: Karleen Minney

  • Sam Thomson takes his three sons Angus (5), Max (9) and Josh (10) out for some holiday fishing on the Lake.
  • Sam Thomson takes his three sons Angus (5), Max (9) and Josh (10).
  • Sam Thomson takes his three sons Angus (5), Max (9) and Josh (10) out for some holiday fishing on the Lake.
  • Gentle boating activity on Canberra's lake Burley Griffin.
  • Boating activity on Canberra's Lake Burley Griffin.
  • Canberra's Lake Burley Griffin.
  • Gentle boating activity on Canberra's lake Burley Griffin.
  • Boating on Lake Burley Griffin.
  • Gentle boating activity on Canberra's lake Burley Griffin.
  • Paddleboating on Lake Burley Griffin.
  • Paddleboating on Lake Burley Griffin.
  • Lake Burley Griffin.

A water quality update, published on Thursday, found algae levels posed no problems for a swimmers, though the report showed that four of the eight lake zones recorded elevated bacterial levels.

Further samples were taken at East Basin, Ferry Terminal, Lotus Bay and Weston Park East on Thursday and the results were expected on Saturday.

If the levels remain high those zones will be closed for swimming, but will remain open for fishing, canoeing, and rowing.

The authority's chief executive, Gary Rake, said bacteria levels often spiked after storms such as those that swept Canberra on Christmas Eve.

He said the stormwater washed debris, such as duck faeces, into the lake, causing temporary leaps in bacteria numbers. But even if the four areas were closed, Mr Rake said popular swimming spots at Weston Park West, Black Mountain Beach, Central Basin and Yarralumla Beach would be open to bathers.

Water police, based in Yarralumla, patrol the lake regularly checking boat permits.