Last updated July 2026
The Waiwhakaiho River provides accessible brown trout fishing close to New Plymouth in Taranaki. Anglers target the upper reaches upstream of Lake Mangamahoe and the lower river below the Mangorei power station outlet. The river supports a healthy population of brown trout averaging 1.2 to 1.5 kg, with some larger specimens. Good water quality in the upper sections and varied access points make it suitable for day trips. Visitors should check river flows and water quality before heading out due to rapid level changes after rain.
Practical Information
| Location | New Plymouth, Taranaki |
| Best fishing sections | Upper reaches upstream of Lake Mangamahoe; lower river below Mangorei power station |
| Season | 1 October to 30 April (check current regulations) |
| Licence required | Fish & Game sports fishing licence |
| Methods | Fly (nymph, dry), spin, bait in permitted areas |
| Bag limit | 2 trout |
| Key access points | SH3 bridges, Rimu Street, Merrilands Domain, Constance Street, William Street |
| Water quality note | Avoid after heavy rain; check LAWA for updates |
About Waiwhakaiho River
The Waiwhakaiho River flows from the slopes of Taranaki Maunga through farmland and into New Plymouth, offering a mix of bouldery riffles, runs, pocket water and pools. Brown trout dominate the fishery and thrive in the clean, flowing waters, particularly in the upper sections where sight fishing is often possible.
The lower river experiences flow variations from the Mangorei power station, which can raise water levels by around 20 cm and increase flow significantly. Anglers need to watch for these changes to avoid being stranded. The river also supports occasional larger fish in deeper pools near the powerhouse.
Public access exists at multiple points along both the upper and lower reaches, with parking available at many sites. The setting combines rural scenery with proximity to the city, making it convenient for local and visiting anglers.
Environmental conditions require attention to rainfall on the mountain, which can cause very rapid river rises. Official advice recommends checking flow data from Taranaki Regional Council before fishing.
Access and Parking
Upper river access includes bridge crossings at Peters Road and SH3 near Egmont Village, with parking on the New Plymouth side of the SH3 bridge and a rough track to the water. Additional entry points require landowner permission on Alfred or Egmont Roads or via Plantation Road and Mangapouri Cemetery.
Lower river access is available from Constance Street off Devon Road, Rimu Street, Merrilands Domain (Audrey Gale Reserve) and William Street off Mangorei Road. Merrilands Domain offers sealed parking, toilets and access to large pools, though the gate may be locked in the evenings. Burgess Park on Junction Road provides further options upstream of the powerhouse pool.
Fishing Techniques and Conditions
Nymph fishing with stonefly, coloburiscus, hare and copper or pheasant tail patterns works well year-round, especially when cast to sighted fish. A small nymph under a bushy dry fly indicator helps cover runs and pocket water effectively.
Dry fly fishing targets evening rises, with cicada patterns useful in January and February. In the lower river, early season bait or spin fishing can be productive in the mornings before power station releases or in the evenings. Swinging caddis pupae imitations also produces results during rises.
Conditions vary with power station generation and rainfall. The upper river maintains better water quality and clarity for spotting fish, while the lower sections feature deeper pools that hold good trout but require prospecting techniques.
Regulations and Safety
A current Fish & Game licence is required. The open season runs from 1 October to 30 April with a daily bag limit of two trout. Artificial fly, spinner and bait are permitted in most areas, though specific restrictions apply around Lake Mangamahoe and the inlet.
Safety considerations include rapid river rises after heavy rain on Taranaki Maunga and flow increases from the power station. Anglers should monitor TRC flow data and avoid crossing when levels are rising. No fishing from boats is allowed in Lake Mangamahoe or the Waiwhakaiho inlet.
What Visitors Often Say
Anglers appreciate the variety of access points close to New Plymouth and the chance to sight fish for solid brown trout in clear upper waters. Many note the convenience of parking at domains and reserves while highlighting the need to watch river levels carefully.
Reviewers often mention successful nymphing sessions and occasional larger fish in the lower pools. Families and beginners value the accessible spots at Merrilands Domain, though some advise checking conditions after rain for the best experience.
Where to Learn More
Fish & Game Taranaki Ringplain: Detailed access descriptions, techniques and river-specific advice for the Waiwhakaiho.
LAWA Waiwhakaiho River: Current water quality monitoring and swimming advisories for the Merrilands Domain site.
Taranaki Regional Council flows: Real-time river level and rainfall data for the Waiwhakaiho catchment.
Frequently Asked Questions
What is the best time of year to fish the Waiwhakaiho River?
The season generally runs from 1 October to 30 April, with good opportunities in the early season in the lower river and consistent nymph fishing in the upper reaches throughout the open period.
Do I need a fishing licence for the Waiwhakaiho River?
Yes, a current Fish & Game New Zealand sports fishing licence is required for all trout fishing.
Are there parking facilities at the main access points?
Yes, on-street or designated parking is available at sites including Merrilands Domain, Rimu Street and SH3 bridge areas, though some gates may close in the evenings.
What should I do if river levels rise suddenly?
Exit the water immediately and check Taranaki Regional Council flow data before returning, as levels can rise rapidly after rain on Taranaki Maunga or due to power station releases.
Is the upper or lower river better for beginners?
The lower river offers easier access from urban points and deeper pools, while the upper river provides clearer water for sight fishing but may require more walking.
Can I fish year-round in some sections?
Parts of the lower river below certain landmarks allow all-year fishing; confirm current boundaries with Fish & Game regulations.
Are there any restrictions near Lake Mangamahoe?
Fishing from boats is prohibited in Lake Mangamahoe and the Waiwhakaiho inlet, and specific season and method rules apply upstream of the lake.
How do I check current water quality?
Visit the LAWA website for the latest monitoring results at sites such as Merrilands Domain and avoid fishing within three days of heavy rainfall.
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