Cypress Creek (CY-01 and CY-02)
About the site:
There are two stations located in the study area on Cypress Creek, CY-01 and CY-02, both downstream of the crossing at Maryland Route 2. Sampled since 2009, pre- and post-restoration data have been collected at these locations. Both sites are located within the restored reach, where an extensive wetland seepage system was installed in 2013. This is a highly developed watershed and both stations are subjected to runoff from extensive impervious surfaces, with coverage estimated to be approximately 48% for CY-01 and 46% for CY-02.
2018 Summary Report:
|Time Frame||BIBI (Condition)||FIBI (Condition)||RBP (Condition)|
|2018 Results||1.57 (Very Poor)||2.67 (Poor)||132 (Supporting)|
|Cumulative Average (2009-2018)||1.67 (Very Poor)||2.67 (Poor)||109 (Partially Supporting)|
|3-year Running Average||1.76 (Very Poor)||2.67 (Poor)||137 (Supporting)|
|Time Frame||BIBI (Condition)||FIBI (Condition)||RBP (Condition)|
|2018 Results||2.43 (Poor)||--||125 (Partially Supporting)|
|Cumulative Average (2009-20181)||1.92 (Very Poor)||3.00 (Fair)||119 (Partially Supporting)|
|3-year Running Average||2.14 (Poor)||3.00 (Fair)||133 (Supporting)|
1) No data for 2013.
Site CY-01: Located furthest upstream, this reach was completely rebuilt in 2013 as part of the extensive restoration work that occurred here. In 2018, this reach’s BIBI score was measured to be a 1.57, the lowest score observed since 2015. The post-restoration average BIBI (1.72) and pre-restoration average (1.74) are nearly identical, with both falling in the Very Poor category. Since sampling began in 2009, this site has been dominated by pollutant-tolerant organisms like oligochaetes (a pollutant-tolerant worm group), leeches, flatworms, and chironomids (non-biting midges). However, post-restoration samples have been collected containing organisms like damselflies (in 2015) and caddisflies (moth-like insects) (in 2016) that are frequently found in healthier streams (Moore and Palmer 2005). While damselflies were found in 2018, a large drop in the number of chironomids occurred, compared to 2017. This shift was simultaneous with an increase in oligochaetes, which made up approximately 80% of the 2018 sample.
The ultimate trajectory in benthic condition remains unclear at this time, but it should be noted that the three-year running average BIBI of 1.76 is higher than the cumulative average of 1.67, although both of these values are in the Very Poor range, indicative of degraded stream health conditions.
Site CY-02: In 2018, CY-02 classified as Poor with a BIBI score of 2.43, which is the same score observed in 2017. The reach containing this site has been dramatically altered by the restoration work and is more emergent wetland in its character than free flowing stream, making sampling a challenge. Pollutant-tolerant organisms, primarily chironomids, dominated the sample.The three year average BIBI is 2.14 (Poor), higher than the cumulative average of 1.92. The upward trend observed in CY-01 is also apparent at this site.
Site CY-01: The FIBI scored better than the BIBI in the monitoring reach with a score of 2.67 (Poor ranking) in 2018. Seven species were observed in 2018: eastern mosquitofish (Gambusia holbrooki), golden shiner (Notemigonus crysoleucas), goldfish (Carassius auratus) mummichog (Fundulus hetroclitus), pumpkinseed (Lepomis gibbosus), brown bullhead (Ameiurus nebulosus)and American eel (Anguilla rostrata). The 2018 fish assessment produced the same FIBI as observed in 2016. No pre-restoration fish samples were collected at this site.
Site CY-02: Like CY-01, fish population conditions as represented by the FIBI were generally better than those observed for macroinvertebrates. A FIBI of 3.00, or Fair, was measured in 2015. For 2016 and 2018, only a qualitative estimate of the fish community was performed as the large wetland pools that comprise part of this reach prevented the setting of block nets that isolate a reach from its overall stream system during sampling (in 2015, this ponded area was excluded by the consultant from sampling). Four species were observed here in 2018, all of which were also observed at CY-01: eastern mosquitofish, golden shiner, mummichog, and pumpkinseed, American eel, golden shiner, and brown bullhead.
Site CY-01: Aquatic habitat conditions have improved since restoration. In 2018, this site was scored at 132 with the RBP, which is in the Supporting category, the same category this site scored as last year. Additionally, the pre-restoration average (85 or Non-supporting) is much lower than the post-restoration average of 137 or Supporting. The high levels of epifaunal substrate and bank stability (from the armored, rip rapped banks), along with good scores for pool variability and the amount of water in the channel, are considered indicative of high quality habitat conditions.
Geomorphically, this site is largely unchanged from its last measurement in 2017. Some slight irregularities in the stream bottom appear in the 2018 plot, but this is likely related to the distribution of cobbles across the cross section causing variability in the survey data. Overall, this section of the restoration project appears to have achieved physical stability but with possible slight degrading. Due to the highly altered nature of this site, however, a Rosgen classification was not performed here.
Site CY-02: In 2018, the RBP score for this reach was 125, which is in the Supporting category. Post-restoration, the average habitat score is 130 (Supporting), while the pre-restoration average is 103, or Partially Supporting. This year’s score is much higher than the all data average of 119 (Partially Supporting) and the three-year running average of 133, in the Supporting category. Pool variability, low to moderate levels of sediment deposition in pools, and the overall channel flow status contributed to the high habitat score.
A new cross section was established in 2016 because the monuments measured in 2012 could not be recovered following the restoration. In addition, no cross section was measured in 2014 & 2015. However, a cursory comparison of the first post-restoration measurement of the channel in this area shows it to be much less entrenched than the channel present before the restoration work occurred, with the thalweg elevation approximately two feet higher now than in 2012. A pebble count was not performed due to the difficulties in collecting particles in the large wetland pool area included in the sample reach. As with CY-01, the highly altered conditions found here due to the restoration activities do not allow a Rosgen classification to be performed.
Historical Data Summary:
|Year||BIBI (Condition)||FIBI (Condition)||RPB (Condition)|
|2009||1.57 (VP)||---||66 (NS)|
|2010||1.57 (VP)||---||117 (PS)|
|2011||1.57 (VP)||---||73 (NS)|
|2012||1.86 (VP)||---||62 (NS)|
|2013||2.14 (P)||---||106 (PS)|
|2015||1.57 (VP)||2.67 (P)||144 (S)|
|2016||1.86 (VP)||2.67 (P)||136 (S)|
|2017||1.86 (VP)||---||145 (S)|
|2018||1.57 (VP)||2.67 (P)||132 (S)|
|Year||BIBI (Condition)||FIBI (Condition)||RBP (Condition)|
|2009||2.43 (P)||---||90 (NS)|
|2010||2.14 (P)||---||117 (PS)|
|2011||1.00 (VP)||---||113 (PS)|
|2012||1.29 (VP)||---||91 (NS)|
|2014||2.43 (P)||---||111 (PS)|
|2015||1.57 (VP)||3.00 (F)||151 (C)|
|2016||1.57 (VP)||---||129 (S)|
|2017||2.43 (P)||---||146 (S)|
|2018||2.43 (P)||---||125 (PS)|
|All Station Summary|
|Average BIBI (SD)||3-Year Average BIBI (SD)||Average RPB (SD)||3-Year Average RBP (SD)|
|CY-01||1.67 (0.32)||1.76 (0.17)||109 (34)||137 (7)|
|CY-02||1.92 (0.57)||2.14 (0.50)||119 (21)||133 (11)|