New River Through An Old City
Two years after Baltimore spent about $5 million rebuilding the Stony Run, the once-dead stream is alive with frogs, toads, ducks, crayfish...even hardy little fish called black-nosed dace.
And later this summer, the city plans to continue the stream reconstruction project from Cold Spring Lane south past University Parkway, all the way into the Wyman Park neighborhood. That will be followed by five more stream reconstruction projects that will cost another $5 million to $10 million, according to the Baltimore Department of Public Works.
The first phase of the project was highly controversial, as some critics complained that too many trees were being cut down in a beautiful and much-loved public park. The project was ugly at first. I know because I live about a block from the stream in the Evergreen neighborhood. Bulldozers flattened bluffs and placed lines of boulders along the banks to discourage erosion. Workers built small dams (like the one shown above) to create small ponds, meant to catch runoff pollution. Burlap-like cloth was draped over the ripped-up sides of the creek.
But over the last two years, the plants have grown back. The park looks lush and green again. And in the new ponds, scores of American toads, green frogs and bullfrogs are singing. No amphibians lived in this stream before the project.
In terms of bringing new life to an urban stream, it's been successful. But one of the main goals of the project was also to filter out pollution and prevent sediment and nitrogen from flowing downstream into the Chesapeake Bay. Bill Stack, a water program administrator for the city's Department of Public Works, said that water quality monitoring before and after the first phase of the project has so far been inconclusive as to whether it really reduced the amount of nitrogen and silt being washed into the bay. This is in part because of the variability of rain fall, which makes it hard to compare the runoff before and after. But he said a visual inspection of the stream suggests their banks are eroding less -- which is good for protecting recently-repaired sewage lines nearby.
“Just to walk the stream, you can tell it’s working,” Stack said. “The data is going to take a while to come, because that’s just science…. But there are a lot of universities that are studying the stream, and they have seen tremendous improvements. We are very happy with it.”
Joel Snodgrass, a biology professor at Towson University and director of the school's urban ecology and conservation lab, introduced 100 finger-sized black nosed dace into the stream in May. He transplanted them from another urbanized stream, the Herring Run, after receiving permission from the Maryland Department of Natural Resources.
The dace survived a few rain storms and started breeding. He's also identified the calls of the toads and frogs in the stream. (To check out his school's great on-line guide to frog and toad calls, click here... it's fun). If you go walking at night in the new artificial wetlands behind the Friends School soccer field, you can hear a chorus of high pitched trilling sounds. Those are American toads. You can also hear the barking, coughing sounds of green frogs. And the deep, low, honking of bullfrogs.
Bullfrog (from Towson University website)
Snodgrass said there's been a decline in amphibians worldwide, but mainly in pristine woods and tropical settings. Pesticides, herbicides are invasive species are suspected in the disappearance of frogs around the world.
But in urbanized settings, it's a different story. The particular varieties of frogs and toads found now in the Stony Run thrive with the construction of stormwater control ponds, Snodgrass said. They do well in streams like this that are fed by water from city streets -- as long as it's not too polluted with road salt. Bullfrogs can thrive in a built-up environment, like squirrels, cardinals or finches.
There are limits to how much can be achieved in an urban stream, Snodgrass cautioned. If a creek is getting its water supply from stormdrains, the creek will never be restored to the way it was before hundreds of acres of parking lots and roads were built up all around it.
But the fact that children can now walk home from school in Baltimore and catch toads along the way provides a real benefit, Snodgrass said. The life in the stream allows urban children to connect to the wild and appreciate the outdoors, instead of just staying inside and staring at computer screens.
The next phase of the Stony Run reconstruction project will start late this summer or early fall, according to city officials.
The stream will be rebuilt from Cold Spring south past University Parkway into the Wyman Park Dell.
Workers will remove wire metal baskets full of rocks that were packed along the stream during an earlier 1980's era style of stream reconstruction. These metal baskets look like this:
Wire baskets along stream. (Photo by Tom Pelton)
They were also meant to prevent erosion -- and at the time, they were thought to be more progressive than just making a cement channel to handle storm water running through a city. And the holes in the wire baskets theoretically allow trees to grow through. But in reality, not much grows through all this steel and rock. The baskets look highly industrial and unnatural -- and for children playing, they can be painful. So all this wire will be ripped out, said Stack of the Baltimore Deparment of Public Works.
“The wire cages were yesterday’s technology, and they haven’t worked that well," Stack said. "We will be removing the cages and grading the slopes and reinforcing them with rock.”
A section of the Stony Run that will be rebuilt this summer. You can see the wall of rocks held together with wire baskets.
“It might not appear as natural,” as the first phase of the Stony Run north of Cold Spring Lane, Stack said. “But it will be infinitely better than what’ s there right now.”
Stack said that a pedestrian bridge over the Stony Run south of Overhill and west of Linkwood will remain. (Which is good, because the scenic bridge is much appreciated by hikers and dog-walkers along this forested stretch.)
But the city workers will be cutting down groves of bamboo along the stream, which gives the area an exotic and shady look. “Its part of our program to remove invasive species as part of our projects," Stack said. "We know that removing certain invasives increases the likelihood that the native vegetation will survive.”
This bamboo grove beside the Stony Run will be cut down, as will other non-native plants and trees.
Stack said that he personally likes the way bamboo looks. But he added: “The experts tell me bamboo is horrific for the environment.”
(On a side note: If there are any experts out there who can tell me why bamboo or non-native species are harmful for water quality, please post a comment at the end of this blog. It makes no sense to me. I can see why people don't want invasive species -- because they don't want native plants to be crowded out. But in terms of water quality, you would think that a dense, hardy, thick stand of bamboo would be a good filter for stormwater and prevent erosion).
Next year, the east branch of Stony Run will be rebuilt. It runs through Loyola College and the College of Notre Dame, east of Charles Street.
Five more projects are now being planned for other streams in the city:
1) Maiden’s Choice in West Baltimore. Near Beechfield Avenue, off Frederick Road.
2) Biddison Run in West Baltimore.
3) Powder Mill Run in Liberty Heights.
4) Chinquapin Run in North Baltimore.
5) Western Run, below Pimlico Road.
Stack said each project will rebuild about 2,500 feet of stream and cost between $1.2 million and $2 million.
"These waters are considered impaired," Stack said. "And our long term goal is to eliminate those impairments. But we want to do it in a way that maximizes the quality of life for our residents, and protects infrastructure like roads and sewers.”
(All photos, except bullfrog, by Tom Pelton)