Marcel Huijser Photography Home
This is where I show the most recent images and talk about how they were made. The images typically relate to landscapes and wildlife, but I also blog about photos of highways and mitigation measures for wildlife or road ecology in general. Please contact me if you would like to use any of the images.
All content © Marcel Huijser
Road ecology blog: Wildlife overpass for bighorn sheep, US Hwy 93, Arizona, USA
Wildlife overpass designed for desert bighorn sheep (Ovis canadensis nelsoni), US Hwy 93, NW Arizona, USA. This particular overpass is about 30 m wide and it is the most northern of three wildlife overpasses in the area. It is situated at a ridge; desert bighorn sheep seem to want to cross US Hwy 93 primarily at ridges rather than at flat terrain or gullies. Therefore, for desert bighorn sheep, overpasses seem more appropriate than underpasses.
For other images of wildlife overpasses, including a narrower overpass for bighorn sheep (15 m wide) click here.
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Road ecology blog: Escape opportunity for small animals under wildlife guard, Arizona, USA
Road ecology blog: Combined drainage and escape for small animals under wildlife guard, Arizona, USA.
Combined drainage and escape for small animals under wildlife guard, Arizona, USA. The openings on the side allow for drainage under the culvert. The openings also allow invertebrates, amphibians, reptiles, small mammals and other species that may fall in between the metal bars to escape. For wildlife guards that have a fully enclosed pit with contiguous walls sometimes wooden planks or metal strips are attached, allowing animals to climb out of the pit.
Click here for other images of wildlife guards, cattle guards, electric mats or gates.
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Road ecology blog: Wildlife guard at access road US Hwy 93, Arizona, USA
Road ecology blog: Wildlife guard at access road US Hwy 93, Arizona, USA.
On the second image: Blocked concrete edge at side of wildlife guard at access road US Hwy 93, Arizona, USA. Some wildlife species will walk on the narrow concrete edge of the wildlife guard to access the fenced road corridor. The concrete edge is part of a wall for the pit under the metal bars. Here the edge is made inaccessible to large mammals through an extra piece of wildlife fence.
Click here for other images of wildlife guards, cattle guards, electric mats or gates.
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Road ecology blog: Wildlife jump-out or escape ramp, Nevada, USA
Road ecology blog: Wildlife jump-out or escape ramp, Nevada, USA. The jump-out is designed for desert bighorn sheep (Ovis canadensis nelsoni). In the background is a complex set of mitigation measures to encourage wildlife to cross under the bridge.
Click here for more images of wildlife jump-outs or escape ramps.
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Road ecology blog: Multifunctional underpass for desert bighorn sheep, Nevada, USA
Road ecology blog: Multifunctional underpass for desert bighorn sheep, Nevada, USA.
This is a very complex set of mitigation measures. In the foreground of the first image is Hwy 270 with a wildlife guard to discourage ungulates from entering the road section that goes under the bridge. The fencing leads the ungulates to a narrow at grade crossing opportunity across the off-ramp for US Hwy 93 with two wildlife guards (one on each side). The second image shows a close-up of that situation. Additional wildlife fencing guides the animals under the underpass and keeps the animals physically separated from traffic under the bridge.
Click here for images of other multi-functional underpasses or overpasses.
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Wildlife warning sign for desert bighorn sheep (Ovis canadensis nelsoni), Nevada, USA
Road ecology blog: Wildlife warning sign for desert bighorn sheep (Ovis canadensis nelsoni), Nevada, USA.
Click here for images of other wildlife or livestock warning signs.
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Road ecology blog: Roadside gutter and drainage pipe to reduce erosion, Arizona, USA
Road ecology blog: Roadside gutter and drainage pipe to reduce erosion, Arizona, USA.
Click here for more images of erosion and erosion control measures.
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Road ecology blog: Wildlife jump-out with bar for desert bighorn sheep, Arizona, USA
Road ecology blog: Wildlife jump-out or escape ramp with bar for desert bighorn sheep (Ovis canadensis nelsoni), US Hwy 93, Arizona, USA.
The bar reduces the probability that bighorn sheep will jump up into the fenced road corridor while it does not decrease the probability that the bighorn sheep will jump down to the safe side of the fence.
Click here for more images of wildlife jump-outs or escape ramps.
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Road ecology blog: Support columns and support walls for wildlife underpasses
Road ecology blog: Support columns and support walls for wildlife underpasses.
Support columns for bridges result in a better openness for wildlife than support walls. Here are two underpasses (bridges) next to each other for the two travel directions. One bridge has support pillars, the other bridges has support walls. The walls block a substantial part of the view to the other side of the structure, and this is associated with reduced wildlife use. Support pillars allow animals to see more of what is on the other side of the structure, and this is associated with increased wildlife use.
These bridges are the White Rock Canyon wildlife underpass for desert bighorn sheep (Ovis canadensis nelsoni), US Hwy 93, Arizona, USA.
Click here for more images of wildlife underpasses.
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Road ecology blog: Underpass for desert bighorn sheep, US Hwy 93, Arizona, USA
Road ecology blog: Underpass for desert bighorn sheep (Ovis canadensis nelsoni), White Rock Canyon bridge, US Hwy 93, Arizona, USA.
Note: At this road section overpasses seem to be used more frequently by desert bighorn sheep than underpasses.
Click here for more images of wildlife underpasses.
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Road ecology blog: Wildlife fence, US Hwy 93, NW Arizona, USA
Road ecology blog: Wildlife fence designed for desert bighorn sheep (Ovis canadensis nelsoni), US Hwy 93, NW Arizona, USA.
Click here for other images of wildlife fences.
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Road ecology blog: Wildlife jump-out bar for desert bighorn sheep, US Hwy 93, Arizona, USA
Road ecology blog: Wildlife jump-out or escape ramp with bar for desert bighorn sheep (Ovis canadensis nelsoni), US Hwy 93, NW Arizona, USA. The bar reduces the probability that bighorn sheep will jump up into the fenced road corridor while it does not decrease the probability that the bighorn sheep will jump down to the safe side of the fence.
Click here for more images of wildlife jump-outs or escape ramps.
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Road ecology blog: Wildlife overpass for desert bighorn sheep, US Hwy 93, Arizona, USA
Road ecology blog: Wildlife overpass designed for desert bighorn sheep (Ovis canadensis nelsoni), US Hwy 93, NW Arizona, USA.
This particular overpass is about 15 m wide and it is the most southern of three wildlife overpasses in the area. It is situated at a ridge; desert bighorn sheep seem to want to cross US Hwy 93 primarily at ridges rather than at flat terrain or gullies. Therefore, for desert bighorn sheep, overpasses seem more appropriate than underpasses.
Click here for other images of wildlife overpasses.
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Road ecology blog: Burma-Shave cattle crossing sign series, US Hwy 66, Arizona, USA
Road ecology blog: Burma-Shave cattle crossing sign series, US Hwy 66, Arizona, USA.
Livestock warning sign. Cattle crossing, means go slow, that old bull, is some cow's beau, Burma-Shave, US Hwy 66, NW of Selligman, Arizona, USA.
This is a series of historic road signs along historic Route 66 in Arizona. Burma-Shave was an brand of shaving cream. About 60 years ago it was well known for its advertizements placed on a series of small roadside signs. The text often had a humorous element, and it would rhyme. The signs below were installed along US Hwy 66, fitting for the time when US Hwy 66 (Route 66) was a major route along which many people moved to the west between the 1930s and 1960s. Route 66 started in Chicago and continued all the way to the west coast at Santa Monica. After the construction of the interstate system Route 66 became less used.
Road ecology blog: Wildlife overpass for desert bighorn sheep, US Hwy 93, NW Arizona, USA
Road ecology blog: Wildlife overpass designed for desert bighorn sheep (Ovis canadensis nelsoni), US Hwy 93, NW Arizona, USA.
This particular overpass is about 15 m wide and it is the most southern of three wildlife overpasses in the area. It is situated at a ridge; desert bighorn sheep seem to want to cross US Hwy 93 primarily at ridges rather than at flat terrain or gullies. Therefore, for desert bighorn sheep, overpasses seem more appropriate than underpasses.
Click here for other images of wildlife overpasses.
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All content © 2013 Marcel Huijser
