Black Branch 2

Small headwater stream in agricultural setting. Riparian buffer is severely lacking, especially on the right bank where mowed pasture extends to channel edge. The exposed bedrock substrate and low flow suggest this may be intermittent. The lack of adequate riparian buffer and agricultural land use are primary concerns for water quality support.

The channel appears natural with no evidence of straightening, riprap, or concrete modification. The bedrock substrate provides natural grade control. However, the very narrow and shallow nature of the channel, combined with adjacent pasture use, suggests some historical impact from agricultural land clearing. The channel maintains floodplain connectivity with low banks.

The stream has low banks and appears to maintain floodplain connectivity. No incision is evident - the channel sits at grade with the surrounding pasture. The bedrock substrate prevents downcutting. Agricultural land use in the watershed may have altered hydrology somewhat, but floodplain access is maintained.

The bedrock substrate dominates and shows minimal fine sediment deposition. Some mud and silt is visible in low spots between rock in the down view, but overall deposition is minor. The bedrock nature of the channel limits sediment accumulation potential.

At current low flow conditions, the stream is dominated by very shallow flow over bedrock. Only slow-shallow and fast-shallow regimes are apparent. No deep pools or deep fast areas are visible. The bedrock substrate and low water levels severely limit depth diversity.

Water fills approximately 25-50% of the channel width. Significant bedrock substrate is exposed above the water surface. The flow is concentrated in the lowest portion of the channel bed with much rock exposed on both sides.

The channel appears to be dominated by uniform shallow runs over bedrock. There is little variation between pool and riffle habitat. The bedrock substrate creates some minor micro-riffles but no well-defined riffle-pool sequences are visible.

This is a very small headwater stream flowing over exposed Nashville Basin limestone bedrock in a low-gradient agricultural setting. The bedrock provides natural grade control but limits habitat diversity. The channel has minimal sinuosity and very low depth. This may be better classified as a Rosgen type E (low gradient, slightly entrenched) or even a bedrock-controlled B type, but the extremely small size makes classification uncertain. The bedrock control is the dominant geomorphic feature.

The left bank is low and generally stable with moderate herbaceous and shrub cover. The dormant vegetation provides some root protection. No active erosion or bank failures are visible. Banks are low, which reduces failure potential.

The left bank has approximately 70-90% vegetation coverage with dormant herbaceous plants, shrubs, and scattered trees. The vegetation appears mostly native with dormant grasses and forbs. Some potential for invasive species (possible bush honeysuckle in the shrub layer) but overall coverage is adequate.

Left bank has better vegetative cover than right bank. Low, stable banks with moderate herbaceous and shrub buffer. Some eastern red cedars provide additional structure. Winter dormancy limits visual assessment of vegetation density.

The right bank is low and generally stable but has less root protection than the left bank. Mowed pasture grass extends to the channel edge, providing shallow root protection only. The bedrock substrate at bank level provides natural armoring. Minor bare soil visible at the channel-bank interface.

The right bank has mowed pasture grass extending to the channel edge. While grass coverage is relatively high (70%+), the mowing regime and lack of diverse vegetation reduces bank protection quality. No deep-rooted trees or shrubs provide bank stabilization on this side. The grass-only vegetation is rated lower for bank protection function.

Right bank severely lacks riparian buffer. Mowed pasture extends directly to channel edge with no transition zone. While banks are naturally stable due to low height and bedrock, the lack of woody vegetation reduces long-term bank stability and ecosystem function.

The left bank has a narrow strip of herbaceous vegetation and scattered trees/shrubs extending approximately 10-25 feet from the channel before transitioning to more open agricultural land. While this is wider than the right bank buffer, it still falls short of recommended 30ft minimum TDEC buffer width. Some shrubs and cedars provide structure but the buffer is not continuous.

The right bank has essentially no riparian buffer. Mowed pasture grass extends directly to the channel edge. Only a few scattered individual trees are present, providing negligible buffer function. Filtering, shading, and bank protection functions are severely compromised.

The floodplain vegetation is severely altered from natural conditions. The right side is mowed pasture. The left side has some herbaceous and shrub growth but lacks mature forest cover. The riparian zone has been largely cleared for agricultural use on both sides. Vegetation is not in a natural state.

During winter dormancy, canopy cover is very low with bare deciduous trees providing minimal shade. Even during growing season, the scattered nature of trees and lack of continuous canopy would likely result in less than 25% shade over this reach. The right bank contributes almost no shading.

This reach has significant riparian buffer deficiency on both banks. The right bank is most critically impacted with mowed pasture extending to the channel edge. Agricultural land use patterns make buffer restoration feasible if landowner cooperation can be obtained. This area would benefit greatly from TDEC MS4 permit section 4.2.5.4 buffer restoration efforts.

The dominant bedrock substrate provides limited colonization opportunity for macroinvertebrates. While some loose rock fragments are present between bedrock exposures, the overall substrate is flat bedrock with minimal interstitial space. No logs, snags, root wads, or undercut banks are visible. Habitat diversity is severely limited.

Using low-gradient criteria, the bedrock-dominated substrate with minimal root mats or submerged vegetation scores lower. While some loose cobble and gravel fragments are present, the dominant bedrock and some mud/silt in low areas limits habitat quality. Score reflects the mixed nature of bedrock with some loose rock between.

Pools are essentially absent at this flow level. The down view shows a small shallow pool where the surveyor is standing, but it is very shallow with the entire bottom visible. The bedrock substrate and low gradient create a uniform shallow flow regime with no deep pools.

Very limited fish cover is available. Some loose rock fragments on the bedrock provide minimal cover, and some overhanging bank vegetation (particularly on the left bank) offers limited shelter. No logs, deep pools, undercut banks, root mats, or macrophyte beds are visible. The exposed bedrock channel provides very little fish habitat.

No physical barriers to fish movement are visible in this reach. However, the extremely low water depth during baseflow conditions could seasonally limit fish passage through this area. Score of 8 reflects the seasonal flow limitation.

No large woody debris is visible in the channel in any direction. The lack of mature riparian trees, particularly on the right bank, means there is no LWD recruitment source. The channel appears to have been cleared of woody debris, possibly from agricultural maintenance.

Only 1-2 habitat types present for macroinvertebrates. The dominant bedrock substrate offers limited colonization. Some loose cobble and gravel fragments between bedrock exposures provide some interstitial habitat. No leaf packs, submerged logs, undercut banks, or other habitat types visible. The channel is severely lacking in habitat diversity.

Default score of 6 assigned based on habitat assessment rather than direct observation. The bedrock and cobble substrate could support some Group II taxa. Actual community assessment would require sampling.

No macroinvertebrates were directly observed, but the assessment score reflects expected community based on habitat availability. The bedrock substrate with some loose rock could support some facultative taxa. Score of 6 is a default assessment based on habitat potential rather than direct observation. Winter conditions may limit surface visibility of invertebrates.

Suitable Habitat: No

The highly altered agricultural setting with minimal riparian buffer and limited instream habitat provides poor conditions for species of concern. No suitable habitat for rare or threatened species was observed.

No wildlife was directly observed or evidence detected. The winter season and low habitat complexity likely limit wildlife use. The lack of riparian buffer and woody debris reduces available habitat for aquatic and riparian species.

Water appears relatively clear where visible, with the bed easily discernible through the shallow water. Some slight turbidity or brownish color is noted in the down view, but water clarity appears adequate. No sheen, foam, or discoloration observed. The shallow depth limits clarity assessment, but visibility through the water column appears good.

No visible algal growth on the bedrock substrate or in the water. No macrophytes present. The winter season may limit algal and plant growth, so this should be reassessed during growing season. However, the lack of any visible nutrient enrichment indicators is positive.

While no manure is directly visible in the stream, the mowed pasture extending to the channel edge on the right bank indicates livestock or agricultural use. The area appears to be actively managed agricultural land. No livestock are visible in the current scene, but the land use suggests potential for livestock access. No waste pipes or obvious manure deposits observed.

The stream is severely lacking in shade due to the minimal riparian buffer, especially on the right bank. During summer, the exposed bedrock channel with shallow water and no canopy cover would likely experience significant thermal stress. The dark bedrock substrate would absorb and radiate heat, further warming the shallow water. Riparian buffer restoration would significantly improve thermal conditions.

No active permit compliance concerns observed at this location. The primary issue is the long-term lack of riparian buffer associated with agricultural land use.

Terrestrial Invasives Assessment

Aquatic Invasives Assessment

Other Invasive Species

Winter dormancy makes invasive species identification very difficult. Some shrubs on the left bank have branching patterns consistent with bush honeysuckle (Lonicera maackii), and some evergreen vine growth may be Japanese honeysuckle. Confidence is low due to dormant conditions. A follow-up assessment during growing season is recommended for accurate invasive species inventory.