Showing posts with label SH73. Show all posts
Showing posts with label SH73. Show all posts

Wednesday 21 September 2022

At the Otira Viaduct Lookout, Arthurs Pass NP: 18 September 2022

 A enviable view on the route over Arthur's Pass

I was up in Arthurs Pass NP last weekend walking the Arthurs Pass Walking Track (post to follow). after walking the track I drove back up to the Deaths corner Lookout to have a look at the Otira Viaduct. I was last here in May when Karen and I were on our way to Punakaiki for a long weekend here is the post about that trip.

The Otira Valley from the Lookout at Death's corner

The Otira Viaduct is an awesome piece of engineering and when it was completed in 1999 it was one of the most difficult construction jobs under taken in New Zealand up to that time. The builders had to contend with extreme weather, isolation, difficult terrain and some serious engineering problems but the project was finished on time and under budget. 


The Otira Viaduct is 440 meters long

It is an inspiring site from the Lookout which is an old section of SH 73 which used to snake up and over the huge shingle scree face coming down off Hills Peak and Mt Stuart. It is the ideal location for a lookout as it has clear unobstructed views down onto most of the Viaduct. 

Looking up to Hills Peak (1645) from the Viaduct Lookout

Waterfall on the southern side of the Otira Valley

Anyone traveling from the east coast to the west coast on SH73 drives over the Viaduct so it is really impossible to miss. You drive past the turn off to the Deaths Corner Lookout so it is very simple thing to stop for a few moments to check out the view. 

View back to Arthurs Pass from the Viaduct Lookout

View to Mt Barron (1730) from the Viaduct Lookout


Once the Viaduct was completed there was no need for the old road so the approaches on the Arthur's Pass side were turned into a magnificent lookout point. There is a sign posted turn off at the old Deaths Corner with views right down the Otira River Valley. You can see about four kilometers down the valley from here with high mountains closely following the route of the Otira River.


The Viaduct is up to 35 meters above the Otira Valley floor

Before the Viaduct any trip over this pass was always a sphincter clenching experience...it was winding, narrow and heinously steep. Many was the older English car that cooked an engine climbing the switchback road from Candy's Corner to Arthurs Pass.


...steep drop off to the floor of the Otira Valley...

V shaped buttresses protect the Viaduct support columns

There are two fine fenced off lookouts here and both have good views down to the viaduct, Otira River and down the Otira Valley. In fine weather or rain they provide magnificent views of this rugged section of the park. 

A word of caution though...do not cross the fences...there are significant drops from the lookout and a fall from here would not be good for your health. 

SH73 is the road over Arthur's Pass

The Viaduct was opened in 1999 by the PM of the day

You can back up to Arthurs Pass from the lookout as it is only about 2 kilometers up to the head of the Pass. You could walk to the Lookout from Arthurs Pass using the Arthurs Pass Walking Track but you would on the road shoulder from the Pass to the Lookout and I cannot really recommend this on such a narrow and very busy road. 

The access road is an old section of SH73

It is interesting sitting up near the Lookout and watching the cars, trucks and Campervans coming up the Viaduct. The gradient is not that bad but it still looks painful...


A series of vehicles climbing up the Otira Viaduct

The lookout is awesome in fine or wet weather and in fact it is interesting to visit in both conditions. The view is much curtailed in bad weather as the valley below often fills with cloud. You are sitting just about 1100 meters here so it is hardly surprising that the weather is dim a lot of the time. 

Rainy day view of the Otira Viaduct

SH73 is a very busy route from west to east

The Otira Viaduct has received many accolades and awards and has secured access across this formally difficult section of the highway. 


Higher water level in the Otira River after rain

Snow blankets the scree slope on Hills Peak

View from the lower lookout platform at Deaths Corner

Winter view to Arthurs Pass from Deaths Corner Lookout

 If you are lucky you will be entertained by the antics of Kea who live in the local area. There used to be big mobs of them here but the most I have seen here recently at one time would be about 3-5. That is the name for a group of Kea...a Mob. Very apt as they will happily dismantle your car/boat/motor bike if you leave them unattended for too long. They act like a bunch of teenage boys most of the time...

Kea live in the local area around the Lookout

Silver Surfer at Otira Viaduct Lookout in winter

I recommend you stop and check out the view for yourself the next time you pass this way. It is an interesting viewpoint and worthy of your attention. 


Access: The Otira Viaduct is on SH73 between Arthurs Pass Village and Otira. The Lookout is roughly two kilometers west of Arthurs Pass itself and is clearly signposted from both directions. There is space here for about 6-7 cars.
You Tube: Otira Viaduct Lookout

Thursday 12 May 2022

Otira Viaduct Lookout...AKA Death Corner

An engineering marvel...the Otira Viaduct

There is a marvel of engineering technology located right in the heart of one of our National Parks. It is the Otira Viaduct which passes high over the Otira River Valley on State Highway 73 between Arthurs Pass Village and Otira.

The Otira Viaduct in Arthurs Pass NP

Over 440 meters long (1440 feet) and 45 meters high it crosses an area of unstable land and was one of the largest and most expensive local engineering projects of the early 1990's.

A potted history of the Otira-Arthurs Pass Highway:

The road over Arthurs Pass to Otira has always been problematic...it is a high alpine area with massive rainfall events, steep difficult terrain and frequent and large earthquakes. This has made maintaining the route over the pass very difficult to achieve.

Map: Otira Viaduct...dotted line was the old road...now a tramping track

One particular problem was always the massive gravel slips just over the pass and coming down off Hills Peak/Mt Stuart between Pegleg Point and Candy's Corner. This is an active scree slope which frequently slipped over the road every time there was a major storm or a large earthquake. The transport authorities spent many millions each year keeping this section clear.

A trip over this road section was always a sphincter clenching experience...it was winding, narrow and heinously steep. Many was the older English car that cooked an engine climbing the switchback road. 

Hills Peak and Mt Stuart dominate the area around the Viaduct

SH73 winds over Arthurs Pass into the Otira River Valley

By the mid 1980's the authorities had enough and tendered a project to build a permanent solution to this tricky roadway. The winning tender was for a massive elevated viaduct from near Deaths Corner to a point further down the Valley. This would cut out the whole problematic section of the existing road and make maintenance of this vital transport route easier and more secure. 


Silver Surfer at the Otira Viaduct carpark

The project took over 6 years to complete and cost nearly $2 billion dollars but was ultimately successful. It featured many new techniques not previously used in New Zealand and provided a blueprint for similar projects right around the country. 


View down the Otira River Valley from the lookout

The scree slopes coming off Hills Peak/Mt Stuart, Arthurs Pass NP

The builders had to contend with brutal conditions especially during the harsh winters which stretched the project out past its intended finishing date. The population of both Arthurs Pass and Otira swelled with the workers constructing the viaduct as they were the closest places they could be housed. After many years of hard work they finished the viaduct in 1999 and it opened to general use. 


You can see how rough the Otira river Valley is...

The Otira Viaduct has received many accolades and awards and has secured access across this formally difficult section of the highway. 

A great viewpoint...

Once the viaduct was completed there was no need for the old road so the approaches on the Arthur's Pass side were turned into a magnificent lookout point. There is a sign posted turn off at the old Deaths Corner with views right down the Otira River Valley. From the lookout you have an unobstructed view of the Otira Viaduct. 

Closer view of the Otira Viaduct

There are two fine fenced off lookouts here and both have good views down to the viaduct, Otira River and down the Otira Valley. In fine weather or rain they provide magnificent views of this rugged section of the park. 

A word of caution though...do not cross the fences...there are significant drops from the lookout and a fall from here would not be good for your health. 


Silver Surfer at the Otira Viaduct on a rainy day

Mist cloaks the mountains above the Otira River Valley

The lookout is awesome in fine or wet weather and if you are lucky you will be entertained by the antics of Kea who live in the local area. They will happily dismantle your car/boat/motor bike if you leave them unattended for too long. 

Native Kea at the Otira Viaduct Lookout

It was a marvel of engineering when it was built and it is still one of the most difficult and expensive road projects in New Zealand history. Don't pass it by on your next trip over Arthurs Pass but stop and have a gander.



Access: The Otira Viaduct is on SH73 between Arthurs Pass Village and Otira. The Lookout is roughly two kilometers west of Arthurs Pass itself and is clearly signposted from both directions. There is space here for about 6-7 cars.
You Tube: Otira Viaduct Lookout