State Highway 25 (New Zealand)

On the west coast of Coromandel Peninsula

SH 25 diverges from SH 2 at a roundabout[1] 3 km north of Mangatarata and 11 km south-east of Maramarua, and runs eastwards across the northern end of the Hauraki Plains. It crosses the Waihou River on the new Kopu Bridge to the junction with SH 26 and turns northwards through the township of Thames. The road continues north on the western side of Coromandel Peninsula, skirting the Firth of Thames, into the small township of Coromandel before travelling eastwards across the peninsula to Kūaotunu on the Bay of Plenty side. There it turns south to Whitianga, running through the outskirts of the town on the Whitianga Bypass, and on through Coroglen and Whenuakite, then over windy hill roads into Tairua, where Pauanui is accessible on a side road. SH 25 continues southwards through the intersection with the spur highway SH 25A just south of Hikuai and on towards Whangamatā. The road bypasses Whangamatā on the west side and continues southbound until it terminates in Waihi at the intersection of Kenny Street & Rosemont Road.[2]

State Highway 25A (SH 25A) traverses Coromandel Peninsula west to east directly from Kopu to Hikuai. This 28.2 km road, opened on 23 March 1967 and sealed in 1973,[3] begins at an intersection with SH26 just 400m away from the SH 25/SH 26 intersection. It terminates at SH 25 just south of Hikuai. SH 25A closed indefinitely in January 2023 due to a large landslide that destroyed a stretch of the road.[4] A bridge is being built across the landslide, with the road estimated to reopen in March 2024.[5]

SH 25 once went through the town centres of Whitianga and Whangamatā. In Whitianga, the bypass was constructed carrying traffic away from the original route via Buffalo Beach Road, Albert Street, and South Highway.[6] In Whangamatā, SH 25 bypasses the town via Tairua Road instead of using Harry Watt Drive, Hetherington Road and Port Road.

In the early 2000s the last sections of the highway were sealed, mainly on the northern part between Coromandel township and Whitianga.[7] In 2011 NZTA completed the new Kopu Bridge, a two-lane structure, across the Waihou River. It replaced the previous one-lane bridge, where at times holidaymakers had to queue for hours to cross. The old bridge, which was built in 1928, is scheduled to be deconstructed although a key part of its history will be preserved.[8][9]

• List of New Zealand state highways