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Fast Facts
Environmental Creek Assessments
Photo Gallery |
| Fast Facts |
| Population |
2000: 7,655
2030: 10,820 |
| Creek Length |
Length 3
miles |
| Drainage Area |
Area 2 square
miles |
| Drains To |
Colorado
River at Town Lake |
| Well Known Sites |
Tarrytown
Park, O. Henry Middle School, Westenfield Park, Johnson Creek
Greenbelt, Casis Elementary |
| Land Use |
Residential
Business
Civic
Parks
Roadways
Undeveloped |
53%
2%
9%
3%
32%
1% |
Watershed Facts
- Johnson Creek watershed is divided along
most of its length by the Loop 1 (MoPac) Expressway.
- The Johnson Creek greenbelt connects Enfield
Road to the Town Lake Hike & Bike Trail.
- The upper portions of the watershed drain
parts of Camp Mabry and stretches through the Tarrytown neighborhood.
- The majority of Johnson Creek watershed is
in the recharge zone, where water travels underground to the
Northern Edwards Aquifer.
- In response to citizen complaints, investigators
find an average of 13 pollution problems each year in Johnson
Creek. Sewage is the most common problem, followed by sediment.
- Overall water quality is impaired with
elevated levels of turbidity,
ammonia, nitrates, total suspended solids, and fecal coliform
bacteria (particularly at the southern end of Tarrytown
park-near Winstead and Tower Dr)
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| Creek
Assessments
Environmental
| Index |
Score |
Category |
Notes |
| Overall
Score |
56 |
Fair |
Johnson ranks 36 out
of 46 watersheds in overall quality |
Water
Chemistry |
49
|
Marginal |
Water quality is average,
conductivity/TDS is high, orthophosphorus is high, suspended
solids are high |
Sediment
Quality |
60 |
Fair |
PAHs are high, herbicides/pesticides
are high, metals are very low |
| Recreation |
53 |
Fair
|
During dry weather conditions,
bacteria is usually not a threat |
| Aesthetics |
73 |
Good |
Some litter is present,
no odor, algae covers 10-20% of creek |
| Habitat |
57 |
Fair |
Some embeddedness, some
channel alteration, buffer zone is too small |
| Aquatic
Life |
36
|
Poor |
Benthic macroinvertebrate
community is marginal; diatom community is bad |
- Aquifer recharge occurring in this creek
results in limited flows which affects aquatic life.
- Development near creek banks resulted
in poor channel and riparian conditions.
Learn
More
How to Help
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| Photo Gallery |
| |
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| Johnson Creek at South
Tarrytown |
Johnson Creek at Woodmont
Ave. |
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