There are "closed" signs up so the track may well be closed - although Warringah Council's Manly Dam web page says it is open.

But if you were to ride past the signs you might find the track is generally "damp" in many parts rather than wet, with avoidable puddles.

• The usual permanently wet sections - after Manly Vale School, after Curl Curl Creek, and up to Allambie Shops, are all wet but rideable.
• The quagmire before Southern Cross Drive is quite a big quagmire.
• And the timber section at the end is slippery.

Your bike will need a wash and some drivetrain adjustments after a ride in the present conditions.

Conclusion: I recommend you consider Manly Dam "amber" until further notice.