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The Environmental Integrity Index (EII) is a tool developed by the City of Austin's Environmental Resource Management Division to monitor and assess the ecological integrity of Austin watersheds. Water chemistry data is collected quarterly and biological and habitat surveys are conducted once per year in the summer.

Water quality data summaries from the most recent EII sampling events for each watershed can be accessed by clicking on the appropriate watershed in the table below.


Watershed Monitoring
2005
2006
2007
Cottonmouth Creek Barton Creek Bear Creek
Decker Creek Blunn Creek Bee Creek
Dry Creek Boggy Creek Bull Creek
Elm Creek Buttermilk Creek Carson Creek
Gilleland Creek Country Club Creek Dry Creek
Harris Branch East Bouldin Creek Eanes Creek
Lake Austin - Running Deer Fort Branch Huck's Slough
Lake Austin - Cuernavaca Harpers Branch Lake Creek
Lake Austin - Turkey Johnson Creek Little Barton Creek
Lake Austin - Panther Hollow Little Walnut Creek Little Bear Creek
Lake Austin - Commons Ford Shoal Creek Little Bee Creek
Lake Austin - Bear Tannehill Branch Onion Creek
Marble Creek Waller Creek Rattan Creek
North Fork (Dry Creek) Walnut Creek Slaughter Creek
Rinard Creek West Bouldin Creek South Boggy Creek
South Fork (Dry Creek) Williamson Creek Taylor Slough (North)
    Taylor Slough (South)

The annual EII reports include watershed summaries in addition to the raw data and a compilation of the annual results. The three most recent annual reports can be accessed by clicking on the appropriate report below.

Reports

 

 


Phased monitoring of Austin’s watersheds began in 1996 when the EII program was organized into three separate phases which were sampled on a three year rotating basis. Phase 1 included the urban watersheds, Phase 2 included peripheral urban and suburban watersheds and Phase 3 included primarily suburban watersheds. A drawback to the phased rotation is that each watershed is only monitored once every three years in our rapidly developing environment.

Changes to the EII monitoring schedule continue to improve resolution and efficiency. An analysis of data from the past decade indicated that several of the EII sites could be dropped in order to make room for a revision of the program toward a two-phase rotation. Starting in 2009, Phase 3 will be dissolved. The watersheds formerly in Phase 3 will be incorporated into Phases 1 and 2. This will increase the frequency watersheds are monitored without significantly increasing the cost of the program. Details of the current project plans can be accessed by clicking on the appropriate report below.

Project Plans

EII Contact:

EII (Non Contact Recreation, Physical Itegrity, Aquatic Life Quality) Quality Assurance Project Plan

EII (Sediment) Quality Assurance Project Plan

EII (Water Quality, Contact Recreation) Quality Assurance Project Plan

Andrew Clamann
PH 512-974-2694

Mateo Scoggins
PH 512-974-1917

 

 

 
flood erosion master plan water quality watershed protection development review

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