Poor Rose.. is it time for a 1 step pruning?
Your rose has fungal disease(s) like mildew and black spot. There are treatments available. Generally you treat new foliage, so it could be as drastic as removing these leaves and spraying to protect the next leaves.
Many homeowners remove disease-prone types, replacing with roses that are more disease resistant or another kind of plant.
Here are some OSU Extension articles about roses you may find helpful:
Choose disease-resistant roses for your yard: http://extension.oregonstate.edu/gardening/choose-disease-resistant-roses-your-yard
How to control rose diseases a less toxic way: http://extension.oregonstate.edu/gardening/how-control-rose-diseases-less-toxic-way