Denso Marston is an industrial factory on Otley Road, Baildon, West Yorkshire. The reserve was created in 1991 and is approx 7 acres in size. Located between the River Aire and the A6038 Otley Road.
Unfortunately there isn't any parking at the reserve, parking is in a lay-by on the A6038 Otley Road, just near St James Church. The road is quite busy so please take care crossing. 
The path to the reserve is on the opposite side of the road, you should see a signpost. The gate is a large kissing gate that should allow you to pass if on a powerchair. I use a Batec power attachment and could still get around the gate. Once through the gate head down the tarmac path for several hundred meters, its not too hilly - just a gentle downward slope.
 
The gate to the reserve is on your right, its a wide one so shouldn't be an issue.
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Most of the paths are well drained and reasonably wide. Some are on dirt so expect to get mucky wheels after rain or during the winter.
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Follow the path away from the gate, soon you will see a path heading left away from you, you can go a way up here but I stuck to the main path, (therefore I can not inform you what lies beyond). 
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Follow this path and eventually you will come to a clearing, here you will find a bird feeding station on your right. Sadly disabled access viewing is not great, you can view from a few feet away but no closer.
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Further down the main path you will come to a pond on your left, a decked platform is here but wheeled access is not provided. Tho you can get as close as you need just past it.
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After the pond follow the path further and across a little bridge, wide enough for any scooter or wheelchair and no steps, just a slight gradient at the ends. After the bridge you follow the track, I decided to just keep going to the river bank and kept going. Its a linear extension but quite nice. Caution - further on this path the side of the path has collapsed, So maybe a good point to turn around carefully. As I had people with me I pressed on with someone to steady my passage one the narrow collapsed bit. There isn't a great need to do this bit but you do get a nice view of the river.
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Turnaround or if you did not add this section head back to the main path, I found a track to the left that was rooty in places. Not a huge issue just take care. Look out for lifting panels either side of the path, lots of hiding amphibians seeking shelter.
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Eventually the path rejoins the main pathway. Retrace you steps and soon you come to the second bird hide on your left.
The frontage nearest you is not suitable if your in a wheelchair - but if you can fit between the structure and a small tree you can reach a better low viewing side, wet grass might make this challenging.
 
After the bird hide head back retracing your route.
 
The reserve does have a disabled loo but the reserve is not staffed all day . The web site states contact the warden who can open the facilities.
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What you may see, you will see the usual array of British birds, lots of Nuthatch and Blue tits. Treecreeper, Kingfisher, Heron and deer. The river Aires gaining a reputation for Otters so do keep your eyes open.
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