A few months ago I did a post call Mosier Valley that featured these crosses. I got curious as to what they were so I did some research. This place is called "Our Garden of Angel's" and it started when a nineteen year old mentally handicapped girl was murdered by two of her co-workers who dumped her body along Trinity Boulevard. Amy's grandmother, Carolyn Baker started the first cross. Before long, other crosses started to appear, each cross commemorating someone who was murdered. The original garden was filled and before long, more crosses starting appearing along the side of Trinity Boulevard.
Below is a plaque that explains more about it.