Where Detention River sits

Detention River is a north‑west Tasmanian river that flows out to Bass Strait at the township of Hellyer. The river is part of a named catchment that is documented in state environmental material for the Black and Detention Rivers catchment. The mouth at Hellyer is the point where the river meets the coast in the region generally described as Tasmania's northwest.

Getting there: roads and turnoffs

Primary vehicle access is from the A2. Secondary access is via spurs off Montumana Road. These named routes are the recorded approaches to reach the river and its immediate surrounds. Road surfaces and local conditions can change, so check the current condition of the A2, Montumana Road spurs and any local notices before you travel.

Fishing rules you need to know

The river is listed in state inland fisheries material with explicit recreational rules. The recorded minimum legal size is 220 mm and the bag limit is five fish. All common methods are listed as permitted, including bait, lures and flies. An open season is recorded for the period 1/8/2026 to 2/5/2027. Seasons, size limits and bag limits can change from year to year, so confirm the current rules with the inland fisheries authority before you plan any fishing activity.

River character and expected conditions

Authoritative listings identify Detention River as a river flowing to Bass Strait at Hellyer. Beyond that, local conditions such as water level, clarity, tide influence at the mouth, bank access or hazards are likely to change with weather, river flows and seasonal effects. Do not rely on a single past description for current conditions. Check recent local updates and, where relevant, tide and flow information for the coastal section.

Heritage and environmental context

There is government material that addresses the Detention River Bridge and it has been the subject of parliamentary reporting tied to environmental and heritage issues. That indicates there may be matters of environmental management, heritage listing or infrastructure work relevant to visitors. If you plan to use bridge crossings, access adjoining reserves or visit protected features, check for any notices about heritage protections or remediation and for temporary restrictions linked to bridge works.

Suitability and what activities fit the site

Detention River is listed in fisheries resources, which makes it a recorded destination for recreational fishing within the stated regulations. The access from the A2 and Montumana Road spurs suggests it is reachable by standard vehicles, subject to road conditions. The river and its catchment are also a focus of environmental and catchment mapping work, so the site may appeal to people interested in catchment studies or river environments as long as they respect any protected or heritage areas.

Practical checks before you go

  • Confirm current fisheries regulations, including the open season, bag limit and minimum size, with the inland fisheries authority. Regulations shown for a specific season will change over time.
  • Check road and access conditions for the A2 and the Montumana Road spurs before travel.
  • Verify whether any bridge works, heritage restrictions or environmental management actions affect access at the Detention River Bridge or nearby sites.
  • If you intend to fish, carry appropriate measuring gear and licences as required by state rules.

On safety and local stewardship

Plan for variable coastal and river conditions. Where a river meets the sea the lower reaches can be affected by tides and weather; check local flow and tide information if your activity depends on the mouth area. Respect signage and any closures related to environmental protection or heritage values. Take rubbish away with you and follow the rules that apply to fishing methods and catch limits.

How to use the information

Treat the recorded season dates, size and bag limits as authoritative for the period they cover, and treat other details such as catchment mapping and parliamentary attention as indicators that the site is both used and managed. Before you go, make the brief checks above so your visit aligns with current rules and local conditions.